在考试中,经常涉及的是It is (high/about) time that sb. did sth.，我们把它看作是一个虚拟语气，后面用一般过去时．与此句相同的还有A would rather that B did sth.
“It is high/about time + 从句”有两种形式
1.从句常用过去式，（如果be用的式过去式，从句则用过去完成式）
eg. It is high time (that) we began our job right awawy.
It is about time (that) I went to pick up my daughter from school.
2. 从句用 should + V 的形式
It is high time (that) we should begin our job.
以本人微薄的英语水平来看 后面是动词不定式 to do It's time to go to school. 是该上学的时间了
It is (about/high) time that + Subject of Attributive Clause（定语从句的主语）+V./did（动词的过去式）（虚拟语气） + (Object of Attributive V. of Attributive Clause（定语从句的谓语的宾语）/sth.).[更常用] or It is (about/high) time that + Subject of Attributive Clause（定语从句的主语）+should（不能省略） + V./do （虚拟语气）+ (Object of Attributive V. of Attributive Clause（定语从句的谓语的宾语）/sth.).
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