Module 1 Small Talk Section Ⅲ Grammar-didn’t need to do和 needn’t have done 语法图解探究发现①I didn't need to get a visa.②It was an informal party so I didn't need to wear a suit.③You needn't have spoken so slowly.④You needn't have watered the flowers, for it's going to rain.⑤You needn't worry about situations like these if you have good social skills.⑥—Need I do the homework first?—Yes, you must./No, you needn't/don't have to.⑦I need to know what I can talk about with the Chinese people that I meet.⑧You don't need to take a gift.⑨Do I need to leave my telephone number and address?⑩The doorneeds oiling.＝The door needs to be oiled.[我的发现](1)①② 句中黑体部分表示“没有必要做某事，而实际上也没做”；③④句中黑体部分表示“本没有必要做某事，而实际上却做了”。(2)⑤⑥ 句中 need 为情态动词，而⑦⑧⑨句中 need 则为实义动词。(3)由⑥句可知，在回答带有情态动词 need 的提问时，肯定回答用 must，否定回答用needn't 或 don't_have_to。(4)由⑩句可知，当主语是表示“物”的名词时，用作实义动词的 need 后接动名词的主动形式表示被动含义。即 need doing 相当于 need_to_be_done。一、didn't need to do 与 needn't have done这两个结构都表示“过去不必做某事”，didn't need to do 通常表示“不必去做某事”，实际上也没做此事；而 needn't have done 则表示“本不必做某事”，从其言外之意可看出，此事已经做了。I didn't need to go to school this Sunday, so I didn't get up until 9 a．m.我这个星期天不必上学，因此我直到早上九点才起床。(我没去学校)I needn't have gone to school today, for it was Sunday today.今天我本不必去上学的，因为今天是星期天。(我去过学校)[即时演练 1] 完成句子①They didn't_need_to_do_it_themselves,_so they went home in advance.他们不需要自己去做，所以他们提前回家了。②We needn't_have_so_hurried.There is still an hour left.我们本没必要那么匆忙，还有一个小时的时间。③We didn't_need_to_take_a_taxi;_it'...
