Grammar
Should Have and Could Have

A sentence with should have or could have generally means the action didn't happen.
E.g.: I could have gone on vacations. (= I didn't go).

A sentence with shouldn't have generally means that the action did happen.
E.g.: I shouldnt' have eaten so much. (= I did eat a lot).

Legal English

In witness whereof: En fe de lo cual.
It is used in legal documents.

E.g.: IN WITNESS WHEROF, this Power of Attorney was executed on 15 March, 2009.

Phrase of the Day:

Tom: Are you playing tennis today?

Barbara: Of course not! It is raining cats and dogs. (i.e. it is raining very heavily).