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。