- 你知道她是否会讲英语吗？
Do you know whether or not she can speak English?
- 你知道她是否会讲英语吗？
Do you know whether she can speak English?
- 我怀疑你是否有东西可写。
I wonder if you have something to write with.
- 谁也不知道他是否爱她。
No one knows if he loves her or not.
- 你是否坐公共汽车去上学？
Do you go to school by bus?
- 为了救许多人牺牲一个人是否道德？
Would it be ethical to sacrifice one person to save many?
- 错误是经常出现还是偶尔出现？错误是否能够模仿？
Does the error occur regularly or sporadically? Is the error reproducible?
