Grammar Guide – Verb Tense

Introduction

Every sentence has a subject and a main verb. Verbs describe what the subject is doing. To be able to show exactly what the subject does at any time, verbs have different forms and tenses. In order to speak and write English correctly, you must learn the various verb forms and tenses.
Learning Hint:
To use verbs accurately, learn the standard verb forms and tenses. Memorize common irregular verb forms that do not follow standard forms.

Verb Forms

Verbs have five forms:

Form	Verb Example	Irregular Verb Example
Infinitive	walk	run
Past tense	walked	ran
Past participle	walked	run
Present participle	walking	running
-s or -es form	walks	runs

The only verb with more than 5 forms is be

Form	Verb
Infinitive	be
Past tense	was (for I / he / she / it); were (for we / you / they)
Past participle	be, been
Present participle	being
-s / -es form	--

The verb be also has 3 present tense forms (am, is, are) while all other verbs have one.

Infinitive Form The infinitive form is the plain or dictionary form. It is used when the verb's action happens in the present and the subject is a plural noun or the pronouns I, we, you, or they:
I go to work.
You cook very well.
We live downtown.
They help me.

Past Tense Form The past tense shows the verb's action happened in the past. It is usually made by adding -d or -ed to the infinitive. The past tense is formed differently for most irregular verbs:
We lived downtown.
They helped me.
I went to work. (Irregular verb)

Past Participle and Present Participle Form
The past participle is used with the verb have (have / has / had) to create the present and past perfect tenses. The past participle form is also used to modify nouns and pronouns. One example is the phrase sliced bread.
The past participle is usually the same as the past tense form. Only some irregular verbs have a past participle that is different than their past tense form.
We have lived downtown.
They have helped me.
I have gone to work. (Irregular verb)
The present participle is made by adding -ing to a verbs infinitive form:
Working
Buying
Eating
The present participle can modify nouns and pronouns. One example is the phrase running water. When used as a noun (example: smoking is bad), the present participle is known as a gerund. The present participle is also used to create the progressive tense.

-S Form
The -s form of a verb is made from the infinitive of the verb. This form is used when the verb's action is in the present and the subject is third-person singular. Third-person singular is a singular noun (examples: desk, John), or a singular indefinite pronoun (examples: everybody, someone), or the personal pronouns he / she / it.
How the -s form is made depends on the last letter of the verb:

Verb Ending	To Make Third Person Singular	Example
s	add -es	Pass - It passes
sh	add -es	Wish - Everyone wishes
ch	add -es	Watch - She watches
consonant + y	change y to i and add -es	Try - He tries
Any other letter	add -s	Drink - He drinks

Verb Types

Irregular Verbs
Many verbs do not follow the rules to make the different forms. They are called irregular verbs. No single rule explains how to make their past tense and past participle forms. The irregular verbs must be memorized. These are some of the common irregular verbs:

Infinitive	Past Tense	Past Participle
choose	chose	chosen
do	did	done
drink	drunk	drank
eat	ate	eaten
give	gave	given
forget	forgot	forgotten
lie	lay	lain
let	let	let
see	saw	seen
sleep	slept	slept
throw	threw	thrown
write	wrote	written

Helping Verbs
Another important type of verb is the helping or auxiliary verb. Helping verbs show tense and can show person, number, voice or mood. These verbs combine with a main verb to form a verb phrase. A main verb is an infinitive, a present participle or past participle. These are verb phrase examples:
will give
has been working
can go
Some helping verbs combine with main verbs to show time and voice. These helping verbs are shall, will, have (has / had), do (does / did) and the forms of be (am / is / are / was / were / been / being):

We will live downtown.	We did not live downtown.
They shall help me.	They were helped.
I have been working.	I had worked.

Modal Verbs
Helping verbs such as can, could, may, might, must, ought, shall, should, will, and would are used to add extra meaning to main verbs. These helping verbs are called modals. They show a necessity, possibility, ability, permission, prediction or responsibility:

You should write that report.	We must go.
He can carry heavy objects.	I might leave.

The helping verb do (does) or its past tense did is used together with the infinitive of a verb to ask questions, make the negative form, or to show added importance:

Does she work this week?	Do they go to school?
Where does he live?	Where did they live?
She does not sleep well.	She did not sleep well.
You do work every day.	He does run on weekends.

Verbals
A verbal (nonfinite verb) is no longer a verb. It is a verb form used as a noun, an adjective, or an adverb. A verbal can never be a main verb.

Verbal	Example	Verb Form
Noun	Running is great exercise.	present participle
Adjective	Blocked printers cannot print.	past tense
Adverb	We were ready to work.	to + infinitive

Verb Tenses

Tense shows the time of a verbs action or being. There are three verb tenses: simple, perfect, and progressive. Each tense has past, present and future forms.
Note: Because tense shows time, a time word in a sentence helps to decide what tense is being used. Most time words can only go with a certain tense. These are some examples:

Present	Past	Future	Progressive
often	yesterday	tomorrow	now
every hour / day / week	last week / month	next week / month	today
every month/year	last year	next year	this month
usually	amount of time + ago	in + amount of time	for + amount of time
sometimes
today
for + amount of time

Simple Tense The simple tenses show that an action or state of being is past, present, or future. The present tense shows action that is happening now as a person speaks or writes. The present tense is also used to describe actions that are factual or habitual (commonly repeated over a period of time). The present tense uses the verbs infinitive or the -s form for third person singular subject.
The past tense shows action that has finished as a person speaks or writes. The past tense uses the verbs past tense form.
The future tense shows action that has not happened yet as a person speaks or writes. The future tense uses the helping verb will or shall plus the verbs infinitive.

Tense	Regular Verb: Walk	Irregular Verb: Run
Present	I / you / we / they walk. He / she / it walks.	I / you / we / they run. He / she / it runs.
Past	I / you / we / they / he / she / it walked.	I / you / we / they / he / she / it ran.
Future	I / you / we / they / he / she / it will walk.	I / you / we / they / he / she / it will run.

Perfect Tense The perfect tenses show that an action was or will be finished BEFORE another time or action happens. The perfect tenses are made with the helping verb have (have / has / had) plus the verbs past participle. All subjects use had for the past perfect tense. All subjects use will have or shall have for the future perfect tense. The infinitive have or has for singular third person is used for the perfect present tense.
Examples:

Tense	Regular Verb: Walk
Present Perfect	I / you / we / they have walked. He / she / it has walked.
Past Perfect	I / you / we / they / he / she / it had walked.
Future Perfect	I / you / we / they / he / she / it will have walked.

Tense	Irregular Verb: Run
Present Perfect	I / you / we / they have run. He / she / it  has run.
Past Perfect	I / you / we / they / he / she / it had run.
Future Perfect	I / you / we / they / he / she / it will have run.

The present perfect tense can also show that an action started in the past and is still going on in the present.
Examples:
He has lived downtown. (Action is finished at the time it is written.)
He has worked for three hours. (Action started in the past and is still going on.)
She has always written in a diary. (Action started in the past but continues now.)

Progressive Tense The progressive tenses show continuing action. They can also show how long an action has been going on for an amount of time in the present, past, or future. A verb's present participle joins with some forms of the verb be (am, is, are, was, were) to make the simple progressive tenses.

Tense	Example
Present Progressive	I am working. You / we / they are working. He / she / it is working.
Past Progressive	I / he / she / it was working. You / we / they were working.
Future Progressive	I / he / she / it / they / we / you will be working.

The past progressive can show an action that happened in the past and was not finished:
He was doing his work. (He was working, but he may not have finished the work.)
The perfect tense form plus been plus the verbs present participle makes the perfect progressive tenses:

Tense	Example
Present Perfect Progressive	I / you / we / they have been working. He  / she / it has been working.
Past Perfect Progressive	I / he / she / it / they / we / you had been working.
Future Perfect Progressive	I / he / she / it / they / we / you will have been working.

Not all verbs can make a progressive tense. Verbs that have qualities not able to show change cannot make the progressive tense. These are some of the verbs:

be	guess	seem	see
believe	include	think	smell
cost	like	understand	taste
desire	love	want	need
doubt	remember	wish	have

Examples:
Incorrect:           She is being pretty.
Correct:             She is pretty.
Incorrect:           That is owning to him.
Correct:             He owns that.
Incorrect:           They are wanting a raise.
Correct:             They want a raise.

this article is taken from http://www.testden.com/toeic/grammar-verb-tense.html

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