Your sentence is structurally correct.
structurally sound
It does not make sense as you do not sip cigarettes and there is no such thing as a sip of cigarettes, but structurally the sentence is ok.
Structurally Sound was created on 15-12-14.
is it folly to raze a structurally sound building?
i do not know how to use embalming in a sentence. (there is the sentence)
How should the union movement respond structurally to the increasing globalization of business?
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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