英语to后面加什么?

　　例句：

　　She will have to go to school.

　　她将不得不去上学。

　　It pleased him to talk to her.

　　和她谈话让他高兴。

　　I managed to swim to safety.

　　我设法游到安全处。

　　I had to go to the hospital.

　　我得去医院看病。