新概念2A语法祈使句.docVIP

新概念英语青少版2A语法：祈使句祈使句是表示请求、命令、劝告、祝愿或建议的句子。祈使句的主语一般为第二人称，但往往省去不用。同学们在学习祈使句时应注意以下几点：一、祈使句谓语用何动词形式英语祈使句的谓语总是用动词原形。如：Be quiet! 别说话!Come earlier next time. 下次早点来。Have a good time. 愿你玩得痛快。Go and tell her. 去告诉她吧。注：有时为了加强语气，可在动词前加do。如：Do be careful. 务请小心。Do come on time. 务必请准时来。二、肯定祈使句如何变成否定祈使句祈使句否定式的构成方法是在动词原形前加dont：Dont be late. 不要迟到。Dont speak so loud. 别这么大声说话。Dont walk on the grass. 不要在草坪上走。Dont lose the key. 别把钥匙丢了。Dont come unless I telephone. 除非我打电话，否则你别来。三、与please连用以使语气委婉为使语气委婉，通常将祈使句与please连用。Please可用于祈使句的句首(其后通常不用逗号)或句末(其前通常用逗号)。如：Please dont get angry. 请不要生气。Please drive more slowly. 请开得慢一点。Please cut me a piece of cake. 请给我切一块蛋糕。Please try to be quiet. 请设法保持安静。Please repeat what youve just said. 请把你刚才说的话重复一遍。四、关于以let开头的祈使句Lets eat out tonight. 我们今晚出去吃饭吧。Let me have a try. 我来试一试。Let me show you how to do it. 我来告诉你怎样做。Let every man do his best. 让每个人人尽其才。 Let the meat cook slowly. 把肉用慢火炖。注意：这类祈使句的否定式有两种形式。如：Lets not hurry. / Dont lets hurry. 我们不要太急。请完成以下习题：一、将以下祈使句改为否定式：1. Come here early. 2. Ask him. 3. Please wait for her. 4. Read the book carefully. 5. Sit under the tree, please. 二. 选择填空 ( )1 .Her doctor said: “_ work so hard” A Stop B Dont C Cant D No ( )2. Sandy, _ to be here at 8 oclock A is sure B is sure that C will be sure D be sure ( )3._ when you cross the road. A Do care B Care C Do be careful D To be careful ( )4. _him the secret, will you? A Dont tell B Not to tell C Not telling D No telling ( )5. _ in bed. Its bad for your eyes. A Not to read B Dont read C Dont to read D Not read ( )6. _ Your child. Well look after him. A Not to worry about B Dont worry aboutC Not worry for D Dont worry with ( )7.They are very tired. Why _ have a rest? A not they B do not they C dont they D not to ( )8 -You look rather tired. _ stopping to have a rest? - All right. A Why not B How about C Why not to D why dont ( ) 9 _ tell a lie. A Hardly B Not C No D Never ( )10.Please _ look outside. Look at the blackboard.