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Most Verbs

Most verbs conjugate like the verb "run" below. Notice how you add an "s" to third-person forms. Third-person negative forms and third-person questions are made using "does."

Positive	Negative	Question
I run.	I do not run.	Do I run?
You run.	You do not run.	Do you run?
We run.	We do not run.	Do we run?
They run.	They do not run.	Do they run?
He runs.	He does not run.	Does he run?
She runs.	She does not run.	Does she run?
It runs.	It does not run.	Does it run?

Instead of "s," "es" is added to positive, third-person forms of verbs ending with the following sounds: s, z, sh, ch, j or zs (as in Zsa Zsa). These special "es"-forms have been marked below with an asterisk*.

Positive	Negative	Question
I rush.	I do not rush.	Do I rush?
You rush.	You do not rush.	Do you rush?
We rush.	We do not rush.	Do we rush?
They rush.	They do not rush.	Do they rush?
He rushes. *	He does not rush.	Does he rush?
She rushes. *	She does not rush.	Does she rush?
It rushes. *	It does not rush.	Does it rush?

To Have

The verb "have" is irregular in positive, third-person forms. This irregular form has been marked below with an asterisk*.

Positive	Negative	Question
I have.	I do not have.	Do I have?
You have.	You do not have.	Do you have?
We have.	We do not have.	Do we have?
They have.	They do not have.	Do they have?
He has. *	He does not have.	Does he have?
She has. *	She does not have.	Does she have?
It has. *	It does not have.	Does it have?

To Be

The verb "be" is irregular in the Simple Present. It also has different question forms and negative forms.

Positive	Negative	Question
I am.	I am not.	Am I?
You are.	You are not.	Are you?
We are.	We are not.	Are we?
They are.	They are not.	Are they?
He is.	He is not.	Is he?
She is.	She is not.	Is she?
It is.	It is not.	Is it?

Modal Verbs

Modal verbs behave differently from other verbs. Notice that they do not take "s" in the third person - there is no difference between first-person, second-person or third-person forms. Like the verb "be" described above, modal verbs also have different question forms and negative forms in simple present.

Positive	Negative	Question
I should go.	I should not go.	Should I go?
You should go.	You should not go.	Should you go?
We should go.	We should not go.	Should we go?
They should go.	They should not go.	Should they go?
He should go.	He should not go.	Should he go?
She should go.	She should not go.	Should she go?
It should go.	It should not go.	Should it go?

To learn more about modal verbs and how they behave differently from other verbs, visit Englishpage.com's Modal Verb Tutorial.

 

출처 : https://www.englishpage.com/verbpage/simplepresentforms.html