EF2/3 Compound sentences

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

mow the lawn

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

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

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.