Depends on which osculation you mean: kissing or mathematics
The word is a noun in both situations. You can have the moment or place of osculation, or in mathematics the plane or circle of osculation.
"The phone rang just before osculation could occur."
"Before he could find the plane of osculation, he needed to get the normal vector."
KissingThe act of kissing.A kiss.Mathematics. A contact, as between two curves or surfaces, at three or more common points.
i do not know how to use embalming in a sentence. (there is the sentence)
Carbonation weathering involves the reaction of carbon dioxide with minerals in rocks, creating carbonic acid which dissolves the minerals. On the other hand, osculation weathering is the process of rocks splitting or breaking apart due to repeated freezing and thawing cycles of water within rock crevices. Both processes contribute to the breakdown of rocks over time.
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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