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1·Sometimes I really doubt whether there is love between my parents.

有时候，我真的怀疑父母之间是否有真爱。

2·I still doubt whether the practical value of this project really exists.

我仍然怀疑这个项目是否有实际价值。

3·I doubt whether Alyssa will accept the invitation the day after tomorrow.

我怀疑艾莉莎是否会在后天接受邀请。

4·I truly doubt whether anyone has ever uttered either of these sentences before.

我真的怀疑以前是否有人说过这两句话。

5·He is so closely hemmed in on all sides that I doubt whether he could escape even if he grew a pair of wings.

密密层层的天罗地网，我看他插翅难飞。《新英汉大辞典》

6·I doubt whether he is still alive.

我怀疑他是否还活着。

7·I doubt whether he will come.

我怀疑他是否会来。

8·I doubt whether he will succeed.

我怀疑他是否会成功。

9·I doubt whether it is true.

我怀疑这是不是真的。

10·I doubt whether he will marry her.

我怀疑他是否会跟她结婚。