1 是存在的。

2 因为英语四级考试注重考察语法、词汇、阅读和写作能力，掌握一些常用的句子和短语可以提高考试分数。3 以下是一些常用的- In my opinion,…- As far as I know,…- It is widely believed that…- According to the statistics…- Therefore,…- On the one hand, … On the other hand,…- To sum up,…- In conclusion,