表示事实或现状

We cannot ignore the fact that...

No one can deny the fact that...

There is no denying the fact that...

表示比较

Compared with A, B...

I prefer to read rather than watch TV.

表示转折

However, on the contrary, I arrived early.

Instead, he chose to pursue a career in teaching.

表示原因分析

To prevent this phenomenon/trend from worsening/running wide, it is necessary/important to...

The high living cost may be the reason why many undergraduates come back to their hometown to seek a job in the government.

表示建议

It is advisable to...

We should consider implementing stricter laws to protect school children from bullying.

表示批驳

In the face of... some people take the position that..., to which I can't attach/add my consent.

It is true that..., but one vital point is being left out.

表示总结

In a word, we should...

To sum up, it is crucial to...

这些句子可以帮助你在专四议论文写作中更有效地表达自己的观点和论据。希望这些句子对你有所帮助!