must need should can的区别还有它们分别用在什么地方

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• need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
• must need should can的区别还有它们分别用在什么地方
• need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
• may,must,need的疑问句答语有什么区别,用它们开头提问该怎么回答分别出来讲我好像听说may.?的答语有个can或者can't的吧,讲肯定、清楚一点 怎么没人来回答我呢
• will would ; shall should ; can could ; must need ; may might以上每组有什么区别,分别应用在什么时候?
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• （有2题）一、根据要求答题 二、用could、can、may、must、needn't填空一、1、could you help me clean the living room?(作肯定回答)__________________,____________________.2、thanks for taking care of my dog.(变同义句)______________________for_____________my dog.3、remember to clean the bed.(改为同义句)________ ________to clean the bed.4、close the door.(变否定句)________ ________the door.5、i need some help(改为一般疑问句)______you______ _______help?6、can you lend your pen to me?（改为同义句）can ______ _________you