3道时态题?5.I think it is necessary for my 19-year-old son to ha

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3道时态题?
5.I think it is necessary for my 19-year-old son to have his own mobile phone,for I sometimes want to make sure if he________home for dinner.
A.comeB.comesC.has comeD.will come
为什么有sometimes是将来是不是现在时?
6.In a room above the store,where a party________,some workers were busily setting the table.
A.was to be heldC.will be heldD.is being held
A和C有什么区别?D表示什么?
7.— What’s wrong with your coat?
— Just now when I wanted to get off the bus,the man next to me ____ on it.
A.sat D.was sitting
为什么不是A,一定要进行时?

5.应该用一般将来时 .
因为是make sure 的宾语从句.
确信将要发生的事.
6.答案是A .
这是非限制性定语从句.
从句时态是过去将来时的被动语态.
be 加动词不定式表示根据安排将要发生的事.
选项C 时态不对应该把will 改成would .
选项D 是现在进行时的被动语态会议正在举行与后面主句的时态不符故错.
7.when 从句表示时间点用一般过去时主句用过去进行时.
再如 when he came in,i was reading.
表示 when这个时间点出现时另一个动作正在进行.
如果 when表示的是时间段主句则须用一般过去时.如 when i was a child,i often went to swim in the river.

英语15.I think it is necessary for my I think it necessary to do sth.还是 I think it is necessary to I think it is good for me.I think it necessary to…… it后什么时候有 I don't think it is necessary for you to attach great import i think it is necessary for children to communication with p My son is eight year old.改错有没有I think it is necessary to. 同义句转换It is not necessary for you to worry about your son‘s s it is necessary to ask for time to think it over i am writing to ask your g____ about my 15-year-old son I think it is necessary for us keep a d_____ every day It is necessary for sb to