1. if 引导的虚拟语气2. 倒装形式Were I you (=if I were you) , I would get up early in the morning.Had you arriv... [查看全文]
实例练习长句: eg. Yale professor and Harvard Hughes Medical Institute investigator Tian Xu directs a research cent... [查看全文]
全部否定和部分否定 eg. All the birds can not fly. Not all the birds can fly. 不是所有的鸟都会飞。 1. 部分否... [查看全文]
在以as, than, when, if, unless等引导的从句中的省略: 在有些状语从句中,如果谓语包含有动词be,主语又和主句的主语一致a),或者主语是... [查看全文]
1) 当let后只有一个单音节动词,变被动语态时,可用不带to 的不定式。They let the strange go.---> The strange was let go. ... [查看全文]
一、可以用作介词⒈)指时间上早于,在……之前,如:She has lived here since before the war.她从战前就一直在这儿住。⒉)指位置... [查看全文]
一、用作及物动词1. 意为"保存;保留;保持;保守"。如:Could you keep these letters for me, please? 你能替我保存这些信吗?I'... [查看全文]
表示义务、意图或建议:必须,应该I must leave at six today. 我今天必须六点钟离开。I must write a letter to the head t... [查看全文]
动词suggest有如下一些用法一、 有"建议"的意思.advise, propose 也有此义,请比较它们用法的异同:1) 都可接名词作宾语She suggested ... [查看全文]
1) 两词都是'必须'的意思,have to 表示客观的需要, must 表示说话人主观上的看法,既主观上的必要。My brother was very... [查看全文]