Question

СРОЧНО!!!!!пожалуйста )))) 2. you / not play / your best game. (yet) 3. I /buy / the tickets. (by the time of their arrival) 5. The coach / talk / to him. (yesterday) 7. According to legend, the ancient Olympic Games / to be founded / by Heracles, the son of Zeus. 8. I / participate / in two competitions. (since I began exercising)

Answer 1

2. You / not play / your best game. (yet) - You haven't play your best game yet.
3. I /buy / the tickets. (by the time of their arrival) - I had bought the tickets by the time of their arrival. 
5. The coach / talk / to him. (yesterday) -The coach talked to him yesterday.
7. According to legend, the ancient Olympic Games / to be founded / by Heracles, the son of Zeus.  - According to legend, the ancient Olympic Games were founded by Heracles, the son of Zeus. 
8. I / participate / in two competitions. (since I began exercising) - I have participated in two competitions since I began exercising. 

Answer 2

2. You have not played your best game yet. This means that while you may have played well in the past, there is still room for improvement and you have the potential to perform even better in the future.

3. I will buy the tickets by the time of their arrival. This implies that the speaker plans to purchase the tickets before they are scheduled to arrive. It indicates a future action that will be completed before a specific point in time.

5. The coach talked to him yesterday. This suggests that the coach had a conversation with him on the previous day. It indicates a past event that occurred specifically on the day before.

7. According to legend, the ancient Olympic Games were founded by Heracles, the son of Zeus. This statement refers to a popular belief or story that attributes the establishment of the ancient Olympic Games to Heracles, who is considered the son of Zeus in Greek mythology.

8. I have participated in two competitions since I began exercising. This implies that the speaker has taken part in two competitions starting from the time they started exercising. It indicates a past action that has occurred multiple times within a specific time frame.