Hi,
You use is if you are talking in the present tense:
...my mother is a nurse...
But you can;t use it for yourself:
...I is a doctor...
You use was in the past tense, this can be for you or other people:
...My mother was a receptionist...
...I was a receptionist...
Hope this helps...
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.