The book which I need it isn't in my schoolbag.
去掉it.
因為主語是the book,不能再用一個主語了.
不能用what,是定語從句,而不是主語或賓語從句.如果說A book is what I need,就要用what.
All that I could do is to send him to school.
去掉that.
All后面的定語從句只能用that,而且一般是省略掉的.
Dr.Stone,who has come for a visit to China ,arrived in Beijing yesterday.
無錯.
This factory will not take anyone of that eyesight is weak.
of that改為whose.
工廠不會要任何弱視力的人.
視力和anyone的關系肯定是從屬關系,所以要用whose來引導定語從句.