动词+介词to+动名词；
动词+宾语+介词to+动名词；
be+形容词(含过去分词)+介词to+动名词；
其他结构+介词to+动名词。
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。
