jenny and i are quiet 为什么用 are 不用 is

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• 一个很难的高中英语单选题—I was wondering if we could go skiing on the weekend.— It ____ good.A：Sounds B：Sounded 然后解释为什么用现在时,而不用过去时?
• 1.You are my first good friend here.这里为什么用my而不用my the?2.My father can wear it for playing basketball.为什么用playing?3.many和much和lot of的区别.4.Let Kate come to Huaxing Clothes Store soon.为什么是come to 5.Mary needs a bag for school.为什么用for不用to?6.I'll take that pair of shoes.为什么用take不用want和need?7.这件绿色的T恤this green T-shirt为什么用this不用the?8.one和ones的用法.9.bring的对应词。
• the man whom i saw told me to come back today.为什么用whom.不用who.
• \— Where did you put the car keys?—— Oh,I ______ I put them on the chair because the phone—— Oh,I ______ I put them on the chair because the phone rang as I ______ in.A.remembered; come B.remembered; was comingC.remember; come D.remember; was coming为什么用D 而不用 B
• I can explained everything __I can to you.为什么用I can explained everything __I can to you.为什么用that.不用what
• I have heard him speak about you often.为什么用speak而不用speaks?
• i never thought about it that way 这里为什么用过去式?希望能有朋友为我解释清楚
• 发电站发电机端电压U＝5000 V,输出功率5000kW,远距离输电线的电阻为80Ω,输电线上功率损耗要求不超过总（1）5×106×4℅＝I22×80I1＝5×106/5000n1∶n2＝I2∶I1所以n1∶n2＝1∶20 （2）5000∶U2＝n1∶n2U3＝U2－I2×80U3∶U4＝192∶1每个用电器的功率P＝U42/10n＝5×106×96℅/P＝192 不用你们算就告诉我5*10^6那里来的就可以了
• I must finish this letter before _going___ home. 为什么用going不用go
• I told her that she could stay with us.为什么用could不用can
• 请问《钢铁是怎样炼成的》作者是书中主人公保尔吗
• 用适当的方法解方程 （1）x2+3x-4=0 （2）4（x-3）2-x（x-3）=0 （3）3x2+12x=5（x+1）-8．