Your use what in a sentence when you are asking a question or when making a statement or declairing something. You can also use it when exclaming something. Here are some examples of each.
Question: "What did the teacher asign for homework?"
Statement: "What you will learn in this chapter is how machines work."
Declaration: "What Americans don't understand is that manners are important at a table."
Exclamation: "What in the world!" (this is question-exclamation)
I dont' mean to be offensive or mean to anything I mention in these sentences.
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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