I should have known better

结构︰

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