if

• 若是如此

  if so

• 若是可以

  if possible

• 我若是知道就不来了。

  If I had known then I wouldn't have come.

• 我若是你，决不会那么办。

  If I were you, I definitely wouldn't have done it like that.

• 若是他拒绝呢？

  And what if he refuses?