Were is plural, used when you are speaking of more than one:
There were ten apples before lunch, now there are six.
Because English lacks a singular second-person pronoun which is different from its plural counterpart, were is used in both cases:
I believe you were going to take out the garbage?
Was is singular, used when you are referring to one:
When Mary came home today, a squirrel was sitting on the step as if waiting for her.
Shush.
Were we going to bed, or was he?
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.