EF2/3 C-51 Compound sentences

1. Jim cut the grass. Ed weeded the garden.
Jim cut the grass, and Ed weeded the garden.
Jim cut the grass, but Ed weeded the garden.
Jim cut the grass, so Ed weeded the garden.

2. I was tired last night, so I went to bed early.
I was tired last night, and I went to bed early.

4. The sun is shining, but it is still cold.

The sun is shining, yet it is still cold. UNUSUAL

5. Mr. Smith earns a lot of money, but he never saves any.

Mr. Smith earns a lot of money, so he never saves any.

6. Jack needs a new jacket, for he lost his leather one. UNUSUAL

Jack needs a new jacket because he lost his leather one. COMPLEX

He lost his leather one, so Jack needs a new jacket. 

Jack lost his leather jacket, so he needs a new one.

VERY NATURAL SOUNDING

7. Tom had no money, so Jack lent him ten dollars.

Tom had no money, but Jack lent him ten dollars.

8. We have to leave in ten minutes, XX I will be late for my appointment.

We have to leave in ten minutes, or I will be late for my appointment.

I don't want to be late for my appointment, so we have to leave in ten minutes.