must/mustn't后面接(原型、现在分词、过去式)

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• must/mustn't后面接(原型、现在分词、过去式)
• ①Who jumps highest in your class?—john ____.A.has done B.did C.does D.do我认为是选B 可答案是选C、 可跳高不已经是过去式了吗?②Today the forests have almost gone.People must____down too many tress .A.stop on cutB.stop from cuttingC.be stop to cut D.be stop from cuttingC③We must do everything we can ____ waste water from running intorivers.A.keep B.kept C.to keep D.keeping can 不是情态动词吗?后面难道不是接原型吗?④ She counldn't __ her words ___by the students.A.get understand B.get understood C
• 帮我检查下句子是否有语法错误?急I sent a lot of resume on last week,but so far I havn't received any message.resume是单数还是复数?message是单数还是复数?have 后面接的是过去式还是现在时,是received吗?
• must/mustn't后面接(原型、现在分词、过去式)
• 第一题1.is,the,bus,the,bench,take,to,going,them,to.2.are,going,when,to,we,swim?3.to,who,we,meet,going,are?4.swim,don't ,after ,meal,第二题look（过去式）——took（原型)——he(宾格)——light(反义词）——big（反义词）——tall（反义词）——thin（反义词）——child（复数)——grow（现在分词）——strong（反义词)——
• 1、Jim,you look worried.What's wrong with you?为毛worry要用过去式?2、You'd better find a pen pal if you don't get much writing practice.don't后面不是加动词原形吗,为什么write用现在分词形式,还有为什么练习又是原型.顺便 you'd的’d的是什么意思哦!3、It's important for us to learn English well.为什么要用for做连词后面为什么又要用动词不定式4、She doesn't have a pen to write with为什么又要动词不定式而后面还要加上with5、I don't have a partner to practice English with.为毛又要加with6、疑问词+to do sth 小弟膜拜中…………………………全副身家奉上………………再感叹一句，英语超级难学！
• 完成时后面是接什么时态啊现在完成时后面是接过去式还是过去分词啊.比如：as you have already seen in the section A,I have a good academic record.中这句话have already 后面是跟的seen,也就是过去分词,可为什么在一些句子中是跟的过去式呢.迷茫了,到底完成时态后面的句子成分是这么个用法呢
• 英语翻译“我郑重的宣布我已经有女朋友了,因为大多数人还不知道”I cordiality announce that I have been have girfriend because someone don't know yet.请修改以上我翻译的,（因为可能语法或用词错误）应该是这样吧 用到的语法是：1.是现在完成进行时 2.did接动词原型I cordiality announce that I have been having girfriend because someone didn't know yet.（have been + 现在分词）
• may是must的过去式吗?
• may;must;shall;的过去式