It is time to do something和It is time for something意思沒有區別，但結構不一樣。
It is time後面可以用三種不同的句型：
It is time for加名詞，如：
It is time for school.
It"s time for lunch.
It is time後面加動詞不定式，如：
It"s time for you to go to school.
It"s time to have lunch.
It is time後面可以用從屬連線詞that引導一個從句，從句中用的是虛擬語氣，也就是說從句的謂語動詞要用過去式，be動詞要用were，例如：
it"s time to do sth 和it"s time for sth 意思都是：是該做……的時候了。
it"s time to do sth 是動詞不定式做目的狀語。例：It is time to sleep 是時候要睡覺。
it"s time for sth是名詞或動名詞做目的狀語。例：It is time for breakfast 該吃早飯了
It is time to do something和It is time for something意思沒有區別，但結構不一樣。
It is time後面可以用三種不同的句型：
It is time for加名詞，如：
It is time for school.
It"s time for lunch.
It is time後面加動詞不定式，如：
It"s time for you to go to school.
It"s time to have lunch.
It is time後面可以用從屬連線詞that引導一個從句，從句中用的是虛擬語氣，也就是說從句的謂語動詞要用過去式，be動詞要用were，例如：
it"s time to do sth 和it"s time for sth 意思都是：是該做……的時候了。
it"s time to do sth 是動詞不定式做目的狀語。例：It is time to sleep 是時候要睡覺。
it"s time for sth是名詞或動名詞做目的狀語。例：It is time for breakfast 該吃早飯了