改为被动句:We must keep the noise under 50dbs here

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• 1.Will you show me?How did you work out that maths problem?(合并成含有宾语从句的复合句）2.He wondered.Is the post office over there?(合并成含有宾语从句的复合句）3.He wtore interesting stories for children.(画线提问,画线部分是children)4.Someone saw her praceise dancing in the hall.(改为被动句）5.We must keep the noise under 50 dbs here.(改为被动句）
• 呵呵``再来几个初三的英语问题哈·!转变下列各句的语态1.we don't clean the classroom every day.The classroom ___ ____ every day.2.We keep the noise under 50dbs here.The noise __ ___under 50dbs here.3.Did they plant many fruit trees on the hill last spring?Many fruit trees __ ___ on the hill last spring?4.Someone saw him swim in Shiyan Lake yesterday.He __ __to swim in Shiyan Lake yesterday.5.Do many people visited our school every day __ our school __ by many people every day?6
• 改为被动句:We must keep the noise under 50dbs here
• 主动语态改为被动语态,在什么情况下主动语态的主语被省略?eg:We must keep the noise under 45dbs her
• We must keep the noise under 50dB（分贝） here.The noise must ______ ______under50dB here
• 将下列句子改为被动语态,英语.1Don't they tell you about it?2.Yesterday our teacher asked us to clean the classroom.3.we must keep the noise under 50dbs here.
• 1 How many desks do they buy every term?2 We must tie the young tree to the stick.将句子变成被动语态,每空一词3 You needn't do it now.It___ ___ ___ by you now.4 People use metal for making machies.Metal___ ___ for making machies.5.He made me do that for him .I___ ___ ____that for him.6 Did they buld a birdge here a year ago?___a bridge __here by them a year ago?(把6第一句改为陈述句的时候,here 应该防在哪里,为什么)还有,麻烦把每一句的答案后都做解释,我希望能够真正知道原因.
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• 1+3=( ) 1+3+5=( ) 1+3+5+9=( ) 1+3+5+7+9=( ).有什么规律?1+3+5+7+9+...+2013等于多少?