Answer:
1. Son los zapatos de mi hermana.
2. El suéter no es caro, es barato
3. Los pantalones no me quedan bien. Son muy grandes. Me quedan muy sueltos
4. .Azul + amarillo = verde
Hope this helps and have great day! =D
Translation:
1. They are my sister's shoes.
2. The sweater is not expensive, it is cheap
3. The pants don't fit well with me. They are very large. They are very loose for me
4. Blue + yellow = green