please help!

[ksu]

pls help, how I can explain the students the meaning of "you could have fed the cat". i'm lost. i need 2-3 ccqs.
thank you!!!

[Soup]

What are ccqs?


could have
used to express a possibility in the past
Example: We could have gone, but we didn't.

http://dictionary.reference.com/browse/could%20have

[ksu]

I need to create a context from which to elicit the model sentence; check student's understanding of the meaning of the underlined phrase using concept questions. i need 2-3 concept questions