there are many uses of have, has and had. because have is a verb and also a helping verb. as a verb it is used for possession. for instance, i have a car, it means, i possess a car. as a helping verbs, have and has are used for present and had for past, always with a third form of verb.
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.
use contingency in a sentence?
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Use it in a big sentence.
.. how can use scrum in a sentence