Here are the rewritten sentences with the words included as per your request:

1. Dad's in the bath again. (singing)
Dad's in the bath again, singing.

2. That sounds a great idea. (like)
I like that idea; it sounds great.

3. My dog runs after birds in the park. (always)
My dog always runs after birds in the park.

4. Polly likes hot food but she’s eating your curry. (doesn't)
Polly doesn't like hot food, but she’s eating your curry.

5. Mum cooks at the weekend. (usually)
Mum usually cooks at the weekend.

6. Why are you drinking the coffee? It’s awful. (tastes)
Why are you drinking the coffee? It tastes awful.

7. I like music but I’m enjoying listening to this! (not)
I like music, but I'm not enjoying listening to this!

8. I go swimming on Sunday mornings. (sometimes)
I sometimes go swimming on Sunday mornings.

9. My mum likes most fruit; she doesn’t like apples. (but)
My mum likes most fruit, but she doesn’t like apples.

10. James loves this band but he isn't at the concert. (enjoying)
James loves this band, but he isn't enjoying the concert.