It has been...（一段時間）+ since
It has been...（一段時間）+ sinceIt has been...（一段時間）+ since引導(dǎo)的從句/自從……以來已經(jīng)……了該句型中since引導(dǎo)的時間狀語從句常用一般過去時。例如：It's twenty years si
2016-12-24
It is/was + 形容詞 + for sb. to do
It is/was + 形容詞 + for sb. to doIt is/was + 形容詞 + for sb. to do.../做某事對某人來說……It是形式主語，真正的主語是不定式to do sth。例如：It's not easy for us to study English well.
2016-12-24
It seems that...似乎……/看樣子
It seems that...似乎……/看樣子It seems that...似乎……/看樣子……；It appears to sb. that.../在某人看來，似乎……此句中的it是主語，that引導(dǎo)的是表語
2016-12-24
It takes/took sb. time/money to do
It takes/took sb. time/money to doIt takes/took sb. time/money to do.../做某事花了某人……時間/金錢it是形式主語，真正的主語是動詞不定式to do sth。例如：It takes her fifteen minutes to
2016-12-24
keep/prevent/stop sb. from doing/阻止某人做
keep/prevent/stop sb. from doing/阻止某人做keep/prevent/stop sb. from doing/阻止某人做……Please keep the children from swimming in the sea.請別讓孩子到海里游泳。The big noise outside
2016-12-24
make/have/let sb. do../讓某人做某事
make/have/let sb. do../讓某人做某事make/have/let sb. do../讓某人做某事make/have/let意為“使”時，其后要有不帶to的動詞不定式。例如： He made me work ten hours a day. 他讓我每天工作10小時。
2016-12-24
not...until.../直到……才……
not...until.../直到……才……not...until.../直到……才……until后可跟名詞或從句，表示時間。例如：He didn't come until late in the evening. 他直到晚上
2016-12-24
spend money/time on sth./(in) doing sth
spend money/time on sth./(in) doing sthspend money/time on sth./(in) doing sth. 在某物/在做某事上花了……時間/金錢其中in可以省略，通常主語為“人”。例如：I spent five yuan on
2016-12-24