in which type of sentences word do or does used , or had or have or can or could?

Question

i m weak in grammer

Answer 1

the word "do" is used with I, you,they as a subject:
I will do it tomorrow. Will you do it tomorrow?They will do it tomorrow.
The word"does" is for he,she, it:
He does it. She does it. It does not seem possible.
The words"had " and "have" may be used by themselves as present tense verbs:
He had an idea. They have an idea.
OR "had " and "have" can be used as helper verbs for past tenses
He has looked all night. They have looked all night.
"can" has the connotation of being able to do it. "could has the connotation of it being a possibility. These two are sometimes used interchangeable.
I can come tomorrow. I could possibly come tomorrow.
This is a quick overview. There are other tenses as well which can get to be complicated.

Hope this helps

Answer 2

The More You Get Into LITERARY Sciences, the More You Become --- (1) A READER (2) A Printer , But, when you come onto the SOURCE of all Literature, you WRITE, DICTATE, EXPRESS, TEACH. All depends upon What, Where, Who, When, Whose, Which, Why, Whom etc. are you looking for, my friend.

Answer 3

1)do is used in using with 1 and 2nd person eg:how do you do,i'll do this work
2)does is used in 3rd person eg:he does not play games
3)had is used in past perfect tense eg:she had been a good dancer
4)have is used in present perfect tense,eg:ihave this desease since last week
5)can is used when we r confident about something Eg:i can not dance
6)could is used when we r not sure about a thing eg:I could sing for u

Answer 4

They are used as the past and present tense.

Answer 5

be more clear on your question

some words can be used both present and past tense

each word you mentioned, really needs to be clarified
as to its tense, present, past, future

typically, do - present tense
does - past
had - past
have - present
can - present
could - past
not always though