THE SIMPLE PRESENT TENSE WITH “TO DO”

Definition: We use the present simple tense of the verb “to do” to show an activity which is true all the time. The verb “to do” is different from the verbs “to be” in this tense. Let get started. The positive is really easy. It's just the verb with an extra “s” if the subject is (he, she, or it). Let us take the verb “study” as an example:
Click here to study how to use the present simple tense.

POSITIVE (OF “STUDY”) FORM: SUB + VERB1 + (OBJ)

I study English.

You study English.

He studies English.

She studies English.

It studies English.

We study English.

They study English.

For a few verbs, there is a spelling change before the “s”. For example, “study” becomes “studies”. 

There are also few verbs which are irregular in the present simple:

“Have” becomes “Has”

“Do” becomes “Does”

“Go” becomes “Goes”

To make the negative form, you need to use “do not” (don't) or “does not” (doesn't).
Click here to study the stative verbs.

NEGATIVE (OF “STUDY”) FORM: SUB + DON’T / DOESN’T + BASE FORM + (OBJ)
I do not study Chinese.	I don't study Chinese.
You do not study Chinese	You don't study Chinese.
He does not study Chinese.	He doesn’t study Chinese.
She does not study Chinese.	She doesn't study Chinese.
It does not study Chinese.	It doesn't study Chinese.
We do not study Chinese.	We don't study Chinese.
They do not study Chinese.	They don't study Chinese.

How about the question form of the present simple tense?

We use “do” or “does” before the subject to make the “yes / no” question:
Click here to study the present simple spelling changes.

YES / NO QUESTIONS FORM: DO/DOES + SUB + BASE FORM + (OBJ)?

Do I study Chinese? – Yes, you do. / No, you don’t.

Do you study Chinese?—Yes, I do. / No, I don’t.

Does he study Chinese?—Yes, he does. / No, he doesn’t.

Does she study Chinese?—Yes, she does. / No, she doesn’t.

Does it study Chinese?—Yes, it does. / No, it doesn’t.

Do we study Chinese?—Yes, we do. / No, we don’t.

Do they study Chinese?—Yes, they do. / No, they don’t.

Just like with “be”, if you'd like to make a “wh” question, you just put the question word at the front:
Click here to study the pronunciation of -s endings.

WH-QUESTION FORM: WH-WORD + DO/DOES + SUB + BASE FORM + (OBJ)?
Where	do I study Chinese?
What	do you study?
Why	does he study Chinese?
Who	does she study with?
When	do we study Chinese?
How	do they study Chinese?