3.在had better, had best, would rather, would rather...than, would sooner, would sooner...than, cannot but, cannot choose but, cannot help but等结构后直接跟动词原形或not +动词原形. You'd better listen to your teacher's opinion. 你最好听一听老师的意见. We had best call for the doctor at once. 我们最好马上就请医生来. She can't do anything but ask silly questions. 她一直在问一些愚蠢的问题. Rather than ride on a crowded bus, he always prefers to ride a bicycle. 他宁愿骑自行车.也不愿挤公共汽车. He cannot but move to another street, because his building has to be pulled down soon. 他不得不搬到另一条街上去.因为他住的大楼很快就要被推倒. We cannot help but admire his courage. 我们情不自禁地钦佩他的勇气. 【查看更多】