if
used to say that something happening, existing, etc. depends on another thing happening, existing, etc.

如果, 假如

[连词]
so
used to emphasize that how much or how intense something is by talking about what happens as a result

如此, 那么

[副词]
before
used to indicate that one event happens earlier than another event in time

在...之前, 在...之前的时间

[连词]
during
used to express that something happens continuously from the beginning to the end of a period of time

在...期间, 在...的过程里

[介词]

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