(The verb impel is different from propel - impel is to encourage, propel to push or throw)
"The desire to win can impel many young athletes to persevere and improve."
"Twin centrifugal pumps impel the water through the ducts in an aquajet."
"The threat of a storm may impel the spectators to leave the game early."
The force which impels an orbiting object out of its orbit is called the centripetal force.
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.