成人高考英语语法归纳及练习十五(3)

来源:
江西成考网
发布日期
2007年02月14日

摘要:  情态动词(二)   内 容 提 要   情态动词有can(能),may(可以),must(必须),have to(不得不),ought to(应该),dare(敢),used to(过去经常),had better(最好),would rather(宁愿)。在肯定句中它们后边都要接 动词原形 .在否定句中,can,may,must和dare后边加not;have to和ought to分别在have和ought后加not;used to的否定式可用used not to,也可用didn't u

. 他走着去了,可当时完全可以坐出租。

  “couldn't+have+ED分词”还表示无论如何也不可能或没有做到

  I couldn't have called you. I wasn't near a telephone. 反正我也不可能给你打电话,我附近没有电话。

  5) “We didn't see him at the lecture yesterday.”He it.“

  [A] mustn't attended[B] couldn't have attended[C] would have not attended[D] needn't have attended

  六、needn't+have+ED分词:表示对过去不必做的事情却做了,可译为“其实不必”

  6) You all these parcels yourself.The shop would have delivered them if you had asked a shop assistant.

  [A] didn't need to carry[B] needn't have carried[C] needn't carry[D] didn't need carry

  七、used to 表示过去的习惯动作或状态,现在已不存在,在否定陈述句中,一般用didn't use to,也可用used not to;在疑问句中用“Did…use to”。used to还可never,often,always等连用。注意used to与be used to的不同,后者表示be accustomed to “习惯于某种状态”,而且跟接名词或ING形式,而used to后接动词原形,试比较

  He used to drink. 表示“他过去经常喝酒”而现在不喝了。

  He is used to wine (He is used to drinking wine) at each meal.

  表示“他现在已养成习惯,每顿饭喝点葡萄酒。”

  八、had better表示“最好……”,后接动词原形,其否定式为had better not+动词原形

  You had better not follow his behavior. 你最好不要学他。

  九、would rath