Jawaban:

1. I joined the gym to get fit. (Corrected from "to getting fit") - The infinitive form of the verb "get" should be used instead of the continuous form "getting."

2. Jogging is a good way to stay in shape. (Corrected from "To jog is a good way to stay in shape") - The subject of the sentence should start with a capital letter.

3. Do you enjoy playing basketball? (Corrected from "Do you enjoy to play basketball?") - The verb "enjoy" should be followed by the gerund form of the verb "play."

4. We had better buy the tickets in advance. (Corrected from "We had better buying the tickets in advance.") - The verb "buy" should be in its infinitive form.

5. I'd rather go to the hockey match than the cinema. (Corrected from "I'd rather going to the hockey match than the cinema.") - The verb "go" should be in its infinitive form.

6. During our walk, we stopped for a picnic at a lovely park. (Corrected from "During our walk, we stopped having a picnic at a lovely park.") - The verb "stop" should be followed by the preposition "for" to indicate the purpose of the stop.

7. Remember to wash your kit before the next match! (Corrected from "Remember washing your kit before the next match!") - The infinitive form of the verb "wash" should be used.

8. The players were too tired to give their best. (Corrected from "The players were too tired give their best.") - The preposition "to" should be added to indicate the purpose of the verb "give."