when the subject in the sentence is plural use are.
when the subject in the sentence is singular use is.
Our children are very clever.
His child is clever too.
"Is" is a singular verb, "are" is a plural one Examples: Sheila is my classmate. Sheila, James, John and Henry are my classmates.
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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