Grammar: 'What + verb' and 'What to + verb'

[Khanhphamqn]

Hi friends, I have something would like to ask you. because I am still ambiguous about using it

Please tell me when we use

1, '' What + verb '' and '' What to + verb ''

2, '' why didn't you play football '' and " Why did you not play football" Are they the same meaning or difference. If it is different Please tell me when we use

Thanks in advance

[Kitosdad]

Did not and didn't mean the same.

Didn't is simply a shorter way of writing, and saying, " did not."

" What " is a questioning word, along with, How, When, Where, Which, Who, Whom, Whose and Why. It has numerous applications, as do they all.
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[KingLion]

What to _do but What if you want to ask about something or certain event like what to do wth this amount of money or what have you done in the week end.

[Kitosdad]

Then the questioning word simply precedes the accompanying text.
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