Prima imagine:

I finished my work.
We work as a team.
Joe swims with dolphins.
They work at the pool.

Joe works alone.
They walk home until later.

a doua imagine: 

Joe and Carol don't go home at 7.00
joe doesn't give the dolphins a fish at every show.
Elephants don't est meat.
Ostriches live in Africa.
Joe swims with the dolphins.
Joe and CArol are finishing work at 7 pm.