All are grammatically correct and standard to use.
(Spelling correction needed in #4. Do you see it?)
1. I prefer to play soccer with them.
2. I prefer playing soccer with them.
(Are both grammatical?)
3. I prefer spring to fall.
4. I prefer palying tennis outdoors to reading books indoors.
5. I prefer to swim rather than read a novel.
6. I prefer to swim rather than to read a novel.
(Are they all grammatical? Which one is correct, #5 or #6?)
7. I prefer to go shopping.
8. I prefer going shopping.
(Are both grammatical?)
2 answers
1 IS NOT GRAMMATICAL.It should be.I prefer playing soccer with them.