英语中不定式的作用是什么?例如：i go to the zoo .有主语I谓语go宾语the zoo还要to

英语中不定式的作用是什么?例如：i go to the zoo .有主语I谓语go宾语the zoo还要to 英语组词成句:the,to,I,go,zoo,sometimes(.) i am going to the zoo ,i am going to go to the zoo 英语补全对话_______ ________ go to the zoo?Go to the zoo?Yes I hea I am going to the zoo tomorrow.I shall go to the zoo tomorro I want to go to the zoo改为一般疑问句 I want to go to the zoo.I can go to the zoo by_____.I wait f I go to the zoo on foot.的同意句是什么? I go to the zoo on foot 的同义句是什么 I want to go the zoo this Sunday.的问句是什么? I will go to the zoo.怎么变一般疑问句 I go to the zoo by ungerground(同义句）