"Thereof" is another (more formal) way of saying "of it".
While you CAN'T say: "I'm sick thereof"
You CAN say: "I don't want to discuss this issue or anything related thereof".
not a perfect example, but you get the gist of it.
(if you were wondering how to use the word "gist", the sentence above is a perfect example).
The Court charges you that the mere fact that there has been an accident and as a result thereof, the plaintiffs have been injured does not, in and of itself, entitle the plaintiffs to recover.
The effect thereof was resoundingly eternal.
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.
How do you use sedition in a sentence
use contingency in a sentence?
use adainty as sentence
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use inmates in sentence
use figureatively in a sentence
Use it in a big sentence.
can i use polymer in a sentence