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

もし, 仮に

[接続詞]
as
used to say that something is happening at the same time with another

〜する時 (〜する とき), 〜と同時に (〜とどうじに)

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

とても, 非常に

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

の間に, 間中

[前置詞]

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