动词不定式怎么理解?在英语中为什么有这个语法的存在?它存在的必要性是...答:当你不用车的时候,锁车是有必要的。 (2) It's very kind of him to help us. 他帮助我们,他真好。 Kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的) 例句: It was silly of us to believe him. 我们真愚蠢,竟然...