5. 带逻辑主语的不定式短语
　　不定式可以有逻辑主语，其构成形式为“for +代词的宾格(或名词) +不定式”。 带逻辑主语的不定式短语可在句子中作主语、宾语、表语或状语等。

　　It is not easy for you to catch up with them in a short time.
　　I think it better for you to see the doctor.
　　What we want is for you to understand the matter clearly.
　　I sent him some pictures for him to see what Paris is like.