A Verb may express action, indicate a state of being or even assist other verbs to build sentences.
Type of Verbs

1. Action Verbs
2. Linking Verbs
3. Auxiliary Verbs

She took the pencil. (action)
They are my brothers. (linking)
We have seen everything. (auxiliary)

1. ACTION VERBS
1. Action verbs express action. That action may be physical or mental.
Physical action: jump, shout, search, run.
Mental action: worry, think, believe, imagine. Care must be taken, however, because many action verbs we know about can also be used as nouns.
We must search the house. (verb)
We must carry out a search. (noun)
He wanted to run away. (verb)
Can I come for a run? (noun)
I will advise you.(verb)
I will give you an advice.(noun)

2. LINKING VERBS
These verbs do not express action. They connect a subject and its complement. By doing this, they make it possible for you to get more information about the subject.
There are three kinds:
a. The verb BE
These include am, is, are, was, were. They also include verb phrases ending with be and been such as will be, should be, has been, should have been, etc.
She is the secretary.
They are the new students
He will be my guest.
He should have been a driver.

b. Verbs related to the five senses
Examples are: look, sound, smell, feel and taste.
The Orange tastes sour. (linking verb)
Sarah tastes the orange. (action verb)

c. Verbs reflecting a state of being
They include: appear, seem, become, grow, turn, prove and remain.
It seems easy at first.
The situation remains tense

3. AUXILIARY VERBS
Auxiliary Verbs help main verbs to build sentences. To do this, an auxiliary verb appears before the verb it is helping.
She has driven the car. We are trying our best. He will see us. I shall do my best.
He doesn't know me. We do not like the idea.
There are four main auxiliaries:
a. BE (am, is, are, was, were, be, being, been)
b. HAVE (have, has, had)
c. DO (do, does, did)
d. MODAL VERBS: i) shall, should, will, would, can, could, may, might, must ,dare
ii) ought to, need to, dare to, used to.

ORDINARY VERBS
Ordinary verbs are all verbs (regular or irregular) that do not belong to any of the auxiliary verbs (be, have, do, or modals)
The auxiliary verbs themselves can play the role of ordinary verbs.
I have a new bag. (ordinary verb)
I have taken my bag (auxiliary verb)
She is my sister. (linking verb)
She is helping my sister. (auxiliary verb)
I do all the work at home. (ordinary verb)
She does her homework everyday. (ordinary)

BE				HAVE				DO
	Present	Past			Present	Past			Present	Past
I	am	was		I	have	had		I	do	did
You	are	were		You	have	had		You	do	did
He	is	was		He	has	had		He	does	did
She	is	was		She	has	had		She	does	did
It	is	was		It	has	had		It	does	did
We	are	were		We	have	had		We	do	did
You	are	were		You	have	had		You	do	did
They	are	were		They	have	had		They	do	did

Look at these sentences:
Saidu has a reason.
Saidu and Joseph have a reason.
He does all the work. They do all the work.
She doesn't know me. They don't know me.
Abu writes a letter every day. Abu wrote to her
Amie knows my house. They know my house.


ttttttttttt
CONTRACTED FORMS
In informal written language we often use the contracted forms of auxiliary verbs.
I'm sure you'll see him when we get there .
That's the way we're going to solve it.
's can be is or has
She's gone to school.(She has gone to school)
She's in school.(She is in school.)
He's gone out.(He has gone out.)
He's my student. (He is my student.)
It's been solved. (It has been solved.)
We've been cheated. You're my friend.
They've been transferred. I'll do my best.
We're still in the place where we were.
I'd like to invite you. I'd been shown the page.
She'd seen the play twice.She'd be here soon
I've been told that you're the secretary.
Note that Let's = let us
Let's see what they're doing.
Let's try our best. Let's go home.
The contracted forms of auxiliary verbs can also be used with other words:
Who's where's there's here's,
that's what's how's Who'd   
Who'll there'll that'll
Where's the money ? Where's he gone
Who's done that. Who's the boy over there.
There's been an accident. There's no hope.
That's the way out. That's been rejected.
What's your name ? What's she said.
There'll be a dance tomorrow. Who'll try next.
Who'd like to come? Who'd been beaten?
That'll be a very good example.
Your can also use contracted forms with names, especially 's.
Mary's gone to school. Mary's in school.

Note: I've seen Mary's house.
The last sentence is a possessive case.
Also note that these contracted forms may not be convenient sometimes.
"Is she here?" Yes, she is. (not Yes, she's)

VERB SHORT VERB SHORT
is not isn't will not won't
are not aren't shall not shan't
was not wasn't cannot can't
were not weren't must not mustn't
has not hasn't would not wouldn't
have not haven't should not shouldn't
had not hadn't could not couldn't
does not doesn't might not mightn't
do not don't need not needn't
did not didn't ought not oughtn't

Almost all auxiliary verbs in their negative forms can be contracted. It is very easy to make an error with them. Note the following:
a.    Always leave a space between not and the auxiliary verb, except for the word cannot which allows no space.
b.    The contracted form allows no space between n't and the auxiliary verb. Eg don't, haven't, couldn't, shouldn't, isn't
c.    Watch the contracted forms for will not and shall not. They appear strange.
d.    Avoid writing words like dont or wont or cant. These are ommon errors. Instead write: don't or won't or can't.
e.    Avoid sentences like:
Let go and greet him. OR Lets go and greet him. Instead write: Let's go and greet him.
It's because the sentence above means:
Let us go and greet him.