ground or grounds

Dear friends,
Can you tell me what is the difference between Ground And Grounds.Heaven and Heavens?

Thank you in advance
Gerald

Hi Gerald

In the Longman English Dictionary (www.ldoceonline.com) the following definitions/example sentences for grounds / heavens are listed:

grounds
an area of land or sea that is used for a particular purpose:
fishing grounds

a good reason for doing, believing, or saying sth:
There are strong grounds for believing his statement.

small pieces of solid material that sink to the bottom of a liquid:
coffee grounds

the heavens
used in a literary context for “the sky”:
Just then the heavens opened (= it started to rain heavily).