写出下列不定式所充当的成分(主语,表语,宾语,,定语,状语) 如: To see is to believe. 主语 To see is to believe . To learn a foreign language is not easy. He wants to buy some stamps . The doctor told me to have a rest . Yesterday they had a story to tell us . Her job is to look after the children. He broke into the house to steal something . I'm so pleased to make friends with you . It's good to help each other . He encourages me to try more.