十三、~~~ enable + Object(受词)+ to + V (..使..能够..)
  例句:Listening to music enable us to feel relaxed.
  听音乐使我们能够感觉轻松。
  十四、On no account can we  + V ~~~ (我们绝对不能…)
  例句:On no account can we ignore the value of knowledge.
  我们绝对不能忽略知识的价值。
  十五、It is time + S + 过去式 (该是…的时候了)
  例句:It is time the authorities concerned took proper steps to solve the traffic problems.
  该是有关当局采取适当的措施来解决交通问题的时候了。