雅思大作文词句
表示原因
There are three reasons for this.
The reasons for this are as follows.
The reason for this is obvious.
The reason for this is not far to seek.
The reason for this is that...
We have good reason to believe that...
表示转折
However, this is not the case.
On the other hand, there are also some problems with...
Nevertheless, we must not overlook the importance of...