Make the sentence grammatical: I think you must go to the gym, it is next except the supermarkets, or If you want you can go to the sport centre with me to play tennis, we can going all week but I think is better gone only three day Monday, Friday and Saturday if you want it isn't too expensive and the teachers being very nice.
I think you must go to the gym, it is next to the supermarket, or if you want you can go to the sports centre with me to play tennis, we can go all week but I think it is better to go only on three days: Monday, Friday and Saturday if you want it isn't too expensive and the teacher is very nice.