Answer:
1. eat (present)
a. My classmates eat dinner with us. (simple)
b. My classmates were eating dinner with us. (present progressive)
c. My classmates have eaten dinner with us. (present perfect
2. study (past)
a. Rudge Anthony studied his lesson. (simple)
b. Rudge Anthony was studying his lesson. (past progressive)
c. Rudge Anthony had been studying his lesson. (past perfect progressive)
3. catch (past)
a. Ysabella caught dragonflies. (simple)
b. Ysabella was catching dragonflies. (past progressive)
c. Ysabella had caught dragonflies (past perfect)