下列各句中均有一处错误，请指出并改正。

1. I’d like to go warm somewhere.                                             

2. I hope you to provide her with some information about the vacation.                 

3. The room needs to be enough big for all the students.                           

4. Please let us to know if it’s best to go there by train.                             

5. It’s too hot. Would you mind to open the window?                                

试述带有普通预启阀的汽门是如何开启的？