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英文问题求解.下列这些短语的区别和意思,他们分别常用在什么时态连用谢谢

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英文问题求解.下列这些短语的区别和意思,他们分别常用在什么时态连用谢谢
by then / by that time / since that time / since then / from then on / from now on .
y then / by that time中的by是“到……为止”,常与一般过去时、过去完成时、一般将来时、将来完成时连用.We will have finished the task by that time.
since that time/ since then中的since是“自从……以来(直到现在)”,常与现在完成时连用.She has lived in the city from then on.
from then on从那时起,常用于一般过去时.I remebered her words from then on.
from now on从现在起,常用于一般将来时.I will study hard from now on.