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1·Goodness, I wonder if he knows.

天哪，我不清楚他知不知道。《柯林斯英汉双解大词典》

2·I wonder if I should wear a coat or not.

我不知道该不该穿外套。《牛津词典》

3·I wonder if you'd be kind enough to give us some information, please?

不知能否请您向我们提供些信息？《柯林斯英汉双解大词典》

4·Nothing more was heard from him so that we began to wonder if he was dead.

此后再没收到他的消息，于是我们开始怀疑他是不是死了。《牛津词典》

5·I wonder if there isn't a streak of femininity in him, a kind of sweetness.

我想知道他身上是否没有一丝女性气质，一种温柔。《柯林斯英汉双解大词典》

6·I wonder if Tom had a good time having a picnic yesterday.

我不知道汤姆昨天野餐玩得好不好。

7·I wonder if my friends now are still friends with you, ten years later.

我不知道我现在的朋友在十年后是否还是你的朋友。

8·I wonder if we shall see the robin?

不知道我们能不能看到那只知更鸟？

9·I wonder if he, too, has donkey fever?

不知道他是不是也在生驴子热？

10·I wonder if I shall ever see you any more!

我不知道还能不能再见到你！