As English becomes more casual and less formal, many people mis-use the word "can"-- it literally means to be able, to be capable of. I can climb the stairs in ten seconds (in other words, I am physically able to do that). But "can" is not the same as "could" or "may," which are polite words that ask for permission to do something. Many people think "can" and "may" are the same, but they are really not. May I have an extra day to turn in my assignment? (Not "can"-- you are physically able to turn in the assignment, I hope, but you are asking permission in this sentence.) So... use "can" when showing an ability-- Denise can speak French fluently. But use "could" when asking permission-- Maria was wondering if she could play Basketball with us.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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Use it in a big sentence.
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