didnt need to do表示过去不必做某事, 事实上也没做。
neednt have done表示过去不必做某事, 但事实上做了。例如:
John went to the station with the car to meet Mary, so she didnt need to walk back home.
约翰开车去车站接玛丽,所以她不必步行回家了。
John went to the station with the car to meet Mary, so she neednt have walked back home.
约翰开车去车站接玛丽,所以她本不必步行回家了。 (Mary步行回家了,没有遇上John的车。)
典型例题
There was plenty of time. She ___.
A. mustnt have hurried B. couldnt have hurried C. must not hurry D. neednt have hurried
答案D.neednt have done. 意为本不必,即已经做了某事,而时实际上不必要。
Mustnt have done 用法不正确,对过去发生的事情进行否定性推断应为couldnt have done, 不可能已经. must not do 不可以(用于一般现在时)。
上一篇: 高考语法:表进行意义的四类介词短语
New fossil discoveries help explain bird evolution 化石新发现有助于解释鸟类进化过程
体坛英语资讯:Top seeds cruise into third round at Roland Garros
国际英语资讯:Spotlight: Turkey, U.S. agree on removing Kurdish fighters from Syrias Manbij
国内英语资讯:China Focus: Xi leads China to win worlds biggest poverty-relief battle
国内英语资讯:Spotlight: Chinas security concept contributing to Asias long-term security, development
体坛英语资讯:Silva: Brazil ready to atone for 2017 World Cup pain
体坛英语资讯:Striker Hahn returns to Augsburg from Hamburg
科学表明网恋不利于人们的心理健康
体坛英语资讯:Montpelliers Mukiele moves to Leipzig
The Future Car 未来的汽车
国内英语资讯:China, Mozambique sign cooperation agreements worth 100 mln USD
雇员抱怨后谷歌公司决定不续延军方合同
“近视”低龄化趋势令人堪忧
Baldness 秃头的烦恼
酒瓶会越来越小
国内英语资讯:FOCAC Beijing summit to elevate China-Africa ties to a new level: Chinese FM
国际英语资讯:Madagascar president nominates Ntsay as new PM
国内英语资讯:China expects DPRK, U.S. to meet each other halfway
小测验 — 和“猫”有关的词汇
国际英语资讯:Saudi-led airstrikes hit Yemens capital after UN envoy left
朝鲜峰会前继续网络攻击行动
普京邀请金正恩访俄
Goodreads推荐:2018夏日书单
体坛英语资讯:Peru cut defender Abram from World Cup squad
体坛英语资讯:Italy stuns China 3-1 in FIVB volleyball Nations League
国际英语资讯:Russian foreign minister visits Rwanda to strengthen bilateral ties
国际英语资讯:Iranian FM urges intl condemnation of U.S. withdrawal from nuclear deal
体坛英语资讯:Los Angeles Clippers Gallinari to visit Vietnam
国际英语资讯:Top diplomats of S. Korea, U.S. hold phone talks over DPRK-U.S. summit
国内英语资讯:Deployment of defensive facilities on S. China Sea islands legitimate, says Chinese military