49.不定式作主语 1.不定式(短语)常可用作主语,如: To see is to believe. 眼见为实。 To act like that is fool... [查看全文]
48.不定式的句法作用 1.除了构成谓语外(如与情态动词构成复合谓语),不定式还可在句中用作: 1)主语: To go or not to g... [查看全文]
47.情态动词need 和dare 一.情态动词need:need只有在疑问句和否定句中可用作情态动词,表示需要: Need we answer this le... [查看全文]
46.情态动词must 和ought 一.must主要用来表示: 1.必须,一定要: We must be careful. 我们必须小心。 You must... [查看全文]
45.情态动词may 和might 一. may可以用来表示 1.(可不)可以: May I ask you a question? 我能问你一个问题吗? ... [查看全文]
44.情态动词can和could I.情态动词can可以用来: 1.表示能够: Two eyes can see more than one. 两只眼睛比一只眼... [查看全文]
43.助动词would 1.would主要用构成过去将来时(可用于各个人称): I knew you would agree. 我知道你会同意的。 I tho... [查看全文]
42.助动词should 1.should作助动词主要用于过去将来时,用于第一人称: I told him that I should see her on Friday.... [查看全文]
41.助动词shall 和will I.助动词shall: 1.shall主要用来构成将来时态,用于第一人称: We shall arrive tomorrow morni... [查看全文]
40.助动词do 助动词do可以用来: 1.构成疑问句: Does he know Chinese? 他懂汉语吗? How do you like the wea... [查看全文]