如果你早点完成作业，我们可以去看电影。

We can go to the movies ___if you finish your homework early.

如果你能把窗户关上就太好了。

___If you could close the window, that would be wonderful.

要是我早点知道这个消息就好了。

___If only I had known this news earlier.

他问我是否能帮他搬箱子。

He asked ___if I could help him move the boxes.

这部电影很精彩，即便算不上杰作。

The movie is amazing, ___if not a masterpiece.