[Grammar] Using Do

[superman11]

Hi. Please can you help me?
how and when we use Do?

 

[Barb_D]

Can you narrow your question a little bit?

It's a very common word and it has a lot of uses. Was there a specific use you had questions about?

 

[sarat_106]

Hi. Please can you help me?
how and when we use Do?

Welcome to this forum.
The verb ‘Do’ can function as a main verb as well as an auxiliary verb (also called helping verb) like can, have, is, and will. As helping verb it is primarily used to form negative or interrogative sentence in simple present or past tense, with a main verb; as:
§ Negative sentence:
I do not play football. (simple present)
She does not know English.
You did not come to my house yesterday. (simple past)
§ Interrogative sentence (questions)
Do I play football?
Does she know English?
How do you do?
Did you come to my house yesterday?

 

[Raymott]

As a main verb, it is used as a substitute for some action verb.
A: "Why did you do that?"
B: "I do that all the time."
A: "Well, please don't do it when I'm around."

"Do" can also be a noun.

 

[superman11]

A big thanks to all of you

 

[macanudo]

You can also use the do-verb to emphasize something or correct someone. For example,

I do speak Japanese, but not very well.

In the above sentence you are emphasizing the fact that you speak Japanese.

I just wrote up an article about this actually. You can read more about the do-verb.