2015年卫生类职称英语考试备战已经开始了，这是小编整理的一些常见的语法，希望对您能有所帮助。开心生活，快乐学习。每天进步一点，积累下来便是巨大的进步。

    I should have known better.

    结构︰主词+should have known better（than to+原形动词）

    说明︰此句型意为“本来不应该那样笨（而…）”，是指已经做过之事，而 know better（不致那样笨）是指未做之事。

    I should have known better.我本来不应该那样笨。

    I know better than to go swimming after dinner.我不致笨得吃过饭就去游泳。

    You should have known better than to talk like that.你本应更懂事而不致说这样的话。

    You should have known better than to go mountain climbing alone.

    你本来不该笨得单独去爬山。