介词和代词一起用时，介词置于代词前，如by oneself, after all
在句子成分中，介词+代词 一般可以作状语
We have twenty students in the club in all.
My mother often tells me to do things by myself.
Don't worry about him. After all , he has been an adult.
There are twenty volunteers in all talking part in the hand -in -hand activity.
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