It is time 有 4 個不同用法：
1) It is time + infinitive（動詞不定式）:
It's time to start the race.(現(xiàn)在是時候開始比賽了.)
It is time to take a break.(現(xiàn)在是時候休息一會兒了.)
2) It is time + for + object + infinitive（賓語+ 動詞不定式）:
It's time for us to start the journey.(現(xiàn)在是時候讓我們開始旅程了.)
It's time for you to go.(你現(xiàn)在是時候去了.)
3) It is time + for + noun（名詞為賓語）:
It's time for breakfast.(現(xiàn)在是時候吃早餐了.)
It's time for a break.(現(xiàn)在是時候休息一會兒了.)
4) It is time + subject + past subjunctive（過去式 - 虛擬句）:
It's time we went home.
It is time he came here.
It is time the police took action.
It's time you made up your mind.
上面第4類 (past subjunctive),我們用過去式動詞 (simple past) 來說現(xiàn)在應該做卻還沒有做的事情,那過去式動詞不是真正的過去式(雖然寫法一樣),這是帶有假設意思的過去式,這個用法叫 unreal past 或是 past subjunctive.
句子
It's time we went home.是該回家的時候了
就是這種用法.
我是加拿大人,前英語老師.