It is time (that) 後所接的從句採用的時態是did一般過去時或should do其中的should不省略的兩種形式。
即
It’s (high/ about) time (that) + 主語 + did
It’s (high/ about) time (that) + 主語 + should do
事實上，It’s (high/about) time (that) 後所接的從句還可以使用四種其他形式:
It’s (high/ about) time (that) + 主語 + ought to do
It’s (high/ about) time (that) + 主語 + was/were doing
It’s (high/ about) time (that) + 主語 + could do
It’s (high/ about) time (that) + 主語 + do
It's (high/ about) time (that) + 主語 + are doing
第1種形式：It’s (high/ about) time (that) + 主語 + did
It’s time (that) sb did sth/ was doing sth並提供了相應的例句：
Isn’t it time these students went to school? 這些孩子們是不是該上學了？
It’s about time 到了該做某事的時候
It’s about time he got himself a proper job. 他該給自己找一份合適的工作。
It’s high time到了該做某事的時候
It’s high time you got a job and settled down. 你該找份工作安頓下來了。
it’s time sb did sth/ was doing sth （= used when saying that someone should do something soon）
某人不久該做某事：
It’s time we had a party. 我們該舉行一次聚會了。
it’s (high) time和it’s about time
這兩個用語和過去時或虛擬語氣連用時指現在和將來：
It’s (high) time he was (or were) taught a lesson.
現在是該教訓他的時候了。
It’s about time he learnt to look after himself.
現在已是他該學會照顧自己的時候了。
（= the time has come現已到時候了）
It’s (high) time和It’s about time之後不可以否定結構，但可以用於簡略答語：
I still haven’t thanked Aunt Lucy for her present.
對露西姑姑送的禮物我還沒有表示感謝呢。
—It’s time you did.
你早該謝謝她了。（你已拖得太久了）
試比較it’s time的用法：
We’ve enjoyed the evening, but it’s time (for us) to go.
今晚我們過得很愉快，不過（我們）該走了。（即：現在是我們該走的時候了）
We’ve enjoyed the evening, but it’s time we went.
今晚我們過得很愉快，不過我們早該走了。（即：我們應該比現在走得早）
It’s time that引導的同位語從句中的虛擬式：
“It’s time that…”中的that是連詞，應看作是time的同位語從句，that在口語中可以省略。傳統語法說這是定語從句的觀點是錯誤的。
2 It’s (high) time (that) we went to bed.
我們早該上床就寢了。（加high表示強調）
It’s time可有下列6種句式：
It’s time for lunch/ for bed.
It’s time to have lunch/ to go to bed.
It’s time for us to have lunch/ for us to go to bed.
It’s time we had lunch/ we went to bed.
It’s time we (should) have lunch/ we (should) go to bed.
It’s time we were having lunch/ we were going to bed.
It’s time we voted the Republicans out. 該是我們把共和黨選下臺的時候了。
作“時間”講，一般用time。注意some time, sometime, sometimes用法
It is (high) time to develop our high technology industry.
該發展我們的高科技產業了。
（= It is time (that) we developed（或should develop）our high technology industry. 這裡用關係副詞that引出定語從句，修飾名詞time。 that和should還可省略。developed和should develop是虛擬語氣的形式。）
《下面幾句都可以說：
It is [was] (high [about]) time for her to go to school.
It is [was] (high [about]) time (that) she went to school.
It is [was] (high [about]) time (that) she should go to school.
It is [was] (high [about]) time (that) she was going to school.
It is [was] (high [about]) time (that) she goes to school.
這幾句都意為：“她（早）該上學了。”
虛擬語氣
It is (high, about) time…句型要求用虛擬語氣
這時，謂語動詞用過去式，指現在或將來的情況，表示“早該幹某事而已經有些晚了”。
It is high time we were off. 是我們該走的時候了。
It is time that we went to bed. 我們該就寢了。
It is time that somebody taught you to behave yourself.
這種結構中的過去式也可改為should + 動詞原形（用should時，不能將其省略）。
第2種形式：It’s (high/ about) time (that) + 主語 + should do
It’s time that引導的同位語從句中的虛擬式：
It’s time可有下列6種句式：
It’s time for lunch/ for bed.
It’s time to have lunch/ to go to bed.
It’s time for us to have lunch/ for us to go to bed.
It’s time we had lunch/ we went to bed.
It’s time we (should) have lunch/ we (should) go to bed.
It’s time we were having lunch/ we were going to bed.
作“時間”講，一般用time。注意some time, sometime, sometimes用法
It is (high) time to develop our high technology industry.
該發展我們的高科技產業了。
（= It is time (that) we developed（或should develop）our high technology industry. 這裡用關係副詞that引出定語從句，修飾名詞time。 that和should還可省略。developed和should develop是虛擬語氣的形式。）
注意that可作關係副詞，引出定語從句
1.It is time that you (should) clean out the room.
現在該是你打掃房間的時候了。（定語從句，其中that還可省略。）
It is [was] (high [about]) time (that) she should go to school.
虛擬語氣6.
It is (high, about) time…句型要求用虛擬語氣
這時，謂語動詞用過去式，指現在或將來的情況，表示“早該幹某事而已經有些晚了”。
It is high time we were off. 是我們該走的時候了。
It is time that we went to bed. 我們該就寢了。
It is time that somebody taught you to behave yourself.
這種結構中的過去式也可改為should + 動詞原形（【用should時，不能將其省略】）。
第3種形式：It’s (high/ about) time (that) + 主語 + was/were doing
I think it’s time we were moving. 我想我們該走了。
It’s time (that) sb did sth/ was doing sth
It’s time we were leaving. 我們得走了。
甚至在about time詞條也提供了was doing 的例句：
about time是（某人該做某事）的時候：
Isn’t it about time we were getting a new car? 難道我們還不該買輛新車嗎？
time（應該做某事或某事應該發生的）時間，時候
it’s time sb did sth/ was doing sth （= used when saying that someone should do something soon）
It is (high) time I was going. [= It is (high) time for me to go.] （此刻）我該走了。
過去進行體用於某些句式表示一種臆想的情況，實際上也就是表示婉轉語氣。
It’s time we were leaving.
It’s time that引導的同位語從句中的虛擬式：
It’s time可有下列6種句式：
It’s time for lunch/ for bed.
It’s time to have lunch/ to go to bed.
It’s time for us to have lunch/ for us to go to bed.
It’s time we had lunch/ we went to bed.
It’s time we (should) have lunch/ we (should) go to bed.
It’s time we were having lunch/ we were going to bed.
It’s time (that) I was leaving. 我該動身了。
move: 前行；離去，離開
It’s time we are moving. 我們該走了。
It is [was] (high [about]) time for her to go to school.
It is [was] (high [about]) time (that) she went to school.
It is [was] (high [about]) time (that) she should go to school.
It is [was] (high [about]) time (that) she was going to school.
It is [was] (high [about]) time (that) she goes to school.
這幾句都意為：“她（早）該上學了。”
注：可用“It is [was] (high [about]) time (that) sb + be + v-ing ”形式的動詞主要有come, go, leave, start, stay等。
第4種形式：It’s (high/ about) time (that) + 主語 + ought to do
It’s time I was moving/ we ought to get moving etc. （口）我/我們等該走了
第5種形式：It’s (high/ about) time (that) + 主語 + do
It’s time that引導的同位語從句中的虛擬式：
It’s time可有下列6種句式：
It’s time for lunch/ for bed.
It’s time to have lunch/ to go to bed.
It’s time for us to have lunch/ for us to go to bed.
It’s time we had lunch/ we went to bed.
It’s time we (should) have lunch/ we (should) go to bed.
It’s time we were having lunch/ we were going to bed.
在It is time後需要使用虛擬語氣（可有下面3種形式）
It is time something be done. （用虛擬現在時）
It is time he go.
作“時間”講，一般用time。注意some time, sometime, sometimes用法
It is (high) time to develop our high technology industry.
該發展我們的高科技產業了。
（= It is time (that) we developed（或should develop）our high technology industry. 這裡用關係副詞that引出定語從句，修飾名詞time。 that和should還可省略。developed和should develop是虛擬語氣的形式。）
注意that可作關係副詞，引出定語從句
1.It is time that you (should) clean out the room.
現在該是你打掃房間的時候了。（定語從句，其中that還可省略。）
It is [was] (high [about]) time (that) she goes to school.
這幾句都意為：“她（早）該上學了。”
第6種形式：It’s (high/ about) time (that) + 主語 + could do
it’s (high) time和it’s about time
這兩個用語和過去時或虛擬語氣連用時指現在和將來：
有時也可以用could（但不可用would）：
Isn’t it about time our baby could walk?
我們的孩子不已到了該會走路的時候了嗎？
有時，偶爾也可用情態動詞could，意為“（現在）該會[能]做……了”，但不可用would。例如：
Isn’t it about time our baby could walk?
(現在)我們的孩子不是已經到了該會走路的時候了嗎？（怎麼還不會走路呢？）（含有焦急等心情）
第7種形式：It’s (high/ about) time (that) + 主語 + are doing
move: 前行；離去，離開
It’s time we are moving. 我們該走了。
我們看到了上面的七種形式，但目前就中高考英語來講，還是使用第1、第2種相對來說更加符合標準化考試的要求——希望看到這裡的學生不要使用出錯。
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