2.whether或if引导的宾语从句
whether或if引导宾语从句时,在句中不充当成分,但是含“是否”之意,从句要用陈述语序。
I wonder whether/if we'll finish the task on time.
我不知道我们能否按时完成这项任务。
I'll see whether/if I can advise him to accept it.
我要看看我是否能劝他接受。
[名师点津]
用whether而不用if引导宾语从句的情况:
①作介词的宾语时,只能用whether;
②与or或or not连用时只能用whether;
③用于There's some doubt whether...句型中;
We are talking about whether we admit students into our club.
我们正在讨论是否让学生加入我们的俱乐部。
I want to know whether it's good news or not.
我想知道这是不是好消息。
We discussed whether we should use the money to buy a new house.
我们讨论了是否该用这笔钱来买套新房子。
There is some doubt whether he will come in time.
他是否能及时赶到值得怀疑。