I'm glad to see you.中的to see you在句中做什么成分

I'm glad to see you.中的to see you在句中做什么成分 英语语法高手请进I am glad to see you .to see you 作什么成分?为什么? I'm glad to see you again. I'm really glad to see you glad to see you i'm so glad to see you,you i'm really glad to see you发音 Hello!I'm glad to see you .When ___you___here? I'm glad to see you again.的意思 I'm glad to see you're an English fan I'm glad to see you all ( ) so happy Hello!I‘m very glad to see you.When___you ___here?