1. There is a girl who is reading a book with legs crossed on the sofa.
2. There is a girl reading a book with her knees folded and raised on the sofa.
3. There are a dog and a cat sleeping on a big coushion.
4. There is a boy playing the piano looking at music.
(Would you check the expressions? Thank you.)
3 and 4 are fine. In 1 and 2, though, you have written what are called "dangling modifiers."
Ask yourself these questions:
1. Are the book's legs crossed...?
2. Are the book's knees folded and raised...?
How can you rephrase 1 and 2 so that these modifiers are clearly describing the girl?
Here are some suggestions to improve the expressions in the sentences you provided:
1. There is a girl who is sitting on the sofa with her legs crossed, engrossed in a book.
- This sentence clarifies that the girl is sitting on the sofa and her legs are crossed while reading a book.
2. There is a girl sitting on the sofa with her knees folded up, engrossed in a book.
- This sentence specifies that the girl is sitting on the sofa, and her knees are folded and raised while she reads a book.
3. There is a big cushion where a dog and a cat are peacefully sleeping.
- This sentence states that there is a big cushion where both a dog and a cat are sleeping. It emphasizes that they are sleeping peacefully.
4. A boy is playing the piano, focusing on the sheet music.
- This sentence highlights that the boy is playing the piano and looking at the sheet music while doing so.
Remember, it's always important to provide enough details and be clear when describing a scene or situation.