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Could I watch TV ,Mom? No,you .You must finish your homework

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Could I watch TV ,Mom? No,you .You must finish your homework first.
Could I watch TV ,Mom?
No,you（ ） .You must finish your homework first.
A.mustn’t B.couldn’t C.may not D.needn’t
选哪个?我觉得是B,可是我们老师说是A
知道的能不能解释下,难道是情态动词的回答can't和couldn‘t不一样?什么时候用couldn't什么时候用can't 呢?
那么You may be 和You might be能否等同?
Excuse me,is this the right way to No.1Middle School?
Sorry,I'm not sure.But it ( )be.
A/can B.need C .must D.might.
这个问题又该选哪个?我们老师说是选D的,可是might不是用于过去式吗?这个句子完全没有过去的时态,can好像也可以表示“可能”的意思吧?
我好混乱啊.
Could I watch TV ,Mom? No,you .You must finish your homework
正确答案应该是 A .
根据答句中的 “你必须先完成家庭作业”可知“你不能看电视”.
用 you mustn't 表示强烈反对的语气.
用 you can't 表示一般的语气“你不能”.
不能用 you couldn't .问句中的 Could I 只表示 委婉的语气,不表示过去时.

You may be 和You might be不相等.
may be 表示 可能.
might be 表示可能性很小.

Excuse me,is this the right way to No.1Middle School?
Sorry,I'm not sure.But it ( ) be.
这一题应该填 might .
根据句意“对不起,我不确定”,可知后面要表达“可能是”.
can 表示“可能”时,只能用于否定句和疑问句.
肯定句中用 may 或者might 表示 可能.
might 比may 的可能性更小一些,might 在这里并不是表示过去时.
Could I watch TV ,Mom? No,you .You must finish your homework May i watch TV now 根据答语填空NO,( ) ( ).you must finish your hom Mom,may I watch TV after dinner?No,you ——.You have to finish — Mom ,must I finish my homework now?—No,you________.You may --May I watch TV now?--I'm afraid ___.You must finish your h -Mum,may I watch TV after supper?- No.You _ finish your home Must I finish my homework now?---No,you ____ you nust not watch TV----you finish your homework a.before b you can not watch tv if you have finish your homework.(同义句） You can watch TV after you finish your homework.改为同义句 1.___________ you finish your homework,you can't watch TV.A. You can't watch TV until you finish ____(do)your homework.