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We left the school compound only after the watchman gave us the all-clear.

This paragraph is very clear to me after u revised it.

If I want to take days off from school, I should clear it with my principal first.

Weather cleared up now, and I think now we can continue our match.

Correct my sentences.
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We left the school compound only after the watchman gave us the all clear.

This paragraph is very clear to me after you revised it.-- Come on, Gary - if you are serious about your English, then spell 'you' properly.

If I want to take any days off from school, I should clear it with my principal first.

The weather has cleared up now, so I think we can continue our match.

Correct my sentences.
What happened to 'please', Gary?

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With 'please' you are asking.

Without 'please' you are demanding.
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Comments  
Thank you Mister Micawber.
Correct my sentences.

What happened to 'please', Gary?

You know it.

Anyway, Is this incorrect if I don't put "please"?
It is not incorrect if you are a dictator. It is very imperious, and you may get negative reactions-- or no one to answer your questions.
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 nona the brit's reply was promoted to an answer.