1.It's time + that clause 时,that可省略,time可由high,about修饰,从句中的谓语动词有两种形式,或者用动词的过去式(be用were);或者用shoud + 动词原形(should不能省略).此句型为虚拟语气句型,表示“现在某人该做某事了”.含有该事早该去做而未做,现在去做似乎都为时已晚的意思.例:
It's time (that)we went to bed.
我们该去睡觉了.
It's high time that the article were published.
发表这篇文章是适时的.
It's time you should do cleaning.
你该去打扫卫生了.
2.useful,有用的;有益的;有帮助的[(+to/for/in)]
available 可得到的,可买到的(还有其他意思)
Is there water available around here?
附近弄得到水吗?
3.We(主语) are talking(谓语) the cars and the models(宾语)
who display the cars 修饰the models 那些为汽车做展销的模特.
that were showen at the exhibition 修饰the cars 和the models 在展览会上陈列出的汽车
we attended last weekend 修饰the exhibition 我们上周末参加的展览会.
意思是我们正在谈论上周末参加的展览会上出现的汽车和那些车模们.
之所以用that 不用 which ,是the cars 和the models 即有人又有物,语法中有这规定.