In the sense you probably mean it, as part of an auxiliary verb, never use "of." Sometimes the "have" auxiliary, as in He would have gone is abbreviated or contracted to 've in speech: "He would've gone." This 've sounds a lot like "of." But it is not, it is always "have."
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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"I can use 'salutary' in a sentence!"