those students are the students who studied very well in previous time

语法错误是没有~但是这句话中有一部分有点多余~如果改成Those students studied very well in previous time就简洁了~

不用这样说啊 完全没有意义
直接就可以those students studied very well in previous time
如果你想强调一下的话可以这样 it is those students that studied very well in previous time
强调句

似乎这样更好:
those are the students who studied very well in previous time.

No,there isn't any.

Those students are the ones who studied very well in previous time.较好

those students who studied very well in previous time这样不就行了 你的好像麻烦了