【正文】
I’d like to know whether he will e or not. 2. Whether 后能加 to do, if 不行。 He doesn’t know whether to work or play. 3. 在介詞后只能用 whether不能用 if. He is trying to find out whether the medicine works * 如果賓語從句表示的是客觀真理,那么不管主句是什么時(shí)態(tài),賓語從句都用一般現(xiàn)在時(shí)。 The teacher told us yesterday that the moon travels round the earth once every day. I was sure that light travels at a speed of 300,000 kilometers per second.