"Semiformal" refers to an event that is more formal than casual, but not as formal as "formal" events. Here are sample sentences:
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Casual
Yes.
sami-formal conversation should like wise require good and correct English
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Semiformal means a suit and tie for men and a cocktail dress for ladies.
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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