I think this is my worst nightmare. 我觉得，这是我做过的最坏的梦。

　　Since you saw mine, I think you have to show me yours. 既然你看了我的，我觉得你也应该让我看看你的。

　　I look at you and I think, this is what I want. 我凝视着你，感觉这就是我所希望的。

　　Your face looks very pale this morning.  你今天早上气；色不太好啊。

　　I think I am going to be sick.  我觉得我要生病了。