我的正确率达60%,不知道能否满足你的要求?
1.
宾语从句：Do you know who can speak English well in our class?
翻译：你知道我们班上谁英语说的好吗?
表语从句：The trouble is who can speak English well in our class.
翻译：问题/麻烦是我们班上是谁英语说的好呢.
2.
主语从句：What you will use to finish the task isn't important.
翻译：你们用什么来完成这个任务,这并不重要.
表语从句：What I'm interested in is what you will use to finish the task.
翻译：我感兴趣的是你们用什么来完成这个任务呢.
3.
主语从句：Whether it will be important to use an e-dictionary is what I want to know.
翻译：使用电子辞典是否会很重要,这是我想要知道的（内容）.
宾语从句：I want to know whether it will be important to use an e-dictionary.
翻译：我想要知道使用电子辞典是否将会很重要.
表语从句：What I want to know is it will be important to use an e-dictionary.
翻译：我想知道的是使用电子辞典是否将会很重要.