初中英语的几个句子问题This is so difficult a problem that few of us can work it out.(为什么要有a,可不可以so difficult a换成such)Fran,with his two sisters,is leaving for London by train which leaves at 8:00 next morning,（为什

初中英语的几个句子问题This is so difficult a problem that few of us can work it out.(为什么要有a,可不可以so difficult a换成such)Fran,with his two sisters,is leaving for London by train which leaves at 8:00 next morning,（为什
初中英语的几个句子问题
This is so difficult a problem that few of us can work it out.(为什么要有a,可不可以so difficult a换成such)
Fran,with his two sisters,is leaving for London by train which leaves at 8:00 next morning,（为什么用这样的时态）
Great changes have taken piace in our province.Many tall buildings have been set up.(为什么是这样的时态）
Roller-skating is a sport that people of all ages can enjoy.(为什么用that,不可以what)
Sam is my best friend whose father is very tall.(为什么是whose,
最后再给我说说,做这种题的技巧.还有,一些句子中,什么时候用do,什么时候用is,我到现在还有时候会搞混……

初中英语的几个句子问题This is so difficult a problem that few of us can work it out.(为什么要有a,可不可以so difficult a换成such)Fran,with his two sisters,is leaving for London by train which leaves at 8:00 next morning,（为什
不能换成such...是要换成such a 喔
Fran要跟他两个姊妹做明天早上八点的火车去伦敦 这个"要去"就是现在的事.
is doing 有两个意思,一个是"正在做"一个是"将要做" 这里就是第二个意思,is leaving将要走
现在完成式,因为
改变"已经"发生了,房子"已经"建起来了
that people of all ages can enjoy 是修饰 sport(运动) ,一个老少咸宜的运动.
如果用which也可以.
Sam is my best friend whose father is very tall
这个who 的句型
那个人 who 丑的不得了
就是: 那个丑的不得了的人
那个人 who 是个秃头
就是: 那个秃头
所以 某人 who 怎样 就是 怎样 的 某人.
你的这个不是who 是 whose
是因为你不是要说
我最好的朋友 who 怎样
是要说
我最好的朋友 who 的爸爸怎样
"他"的爸爸怎麼说? his father.
"谁"的爸爸呢? 就是whose father.
除了 某人 who 怎样 以外,
还有 某东西 which 怎样,
是一样的道理.
这有点复杂,我可能解释的不是很清楚...
加油