Поставьте глагол в нужную форму .используйте past simple,past continuous ,past perfect или past perfect continuous:
1)when i (go) to the shop,i (see) my friends
2)(she/finish)making the lunch when the guests arrived?
3)Mary (watch) TV while her little brother (play) with the kitten/
4)I (eat) my lunch before he (come)
5)How long (you/study) French before you first visited France?
6)"Lisa was exhausted yestarday".-"I know .She (study) for a history exam all day".
7)Kate (go) out wuth her friends after she had finished her homework.
8)Dr. Stephens (perform) a lot of experiments before he made an important discovery.
9)How long (you/wait) before the bus arrived?
10)I (dream) about this camera all my life.

1) When I went to the shop, I saw my friends. - In this sentence, we use the past simple tense for both verbs "go" and "see" because both actions happened and were completed in the past. 2) Was she finished making the lunch when the guests arrived? - In this sentence, we use the past continuous tense "was" for the verb "finish" because the action of finishing making the lunch was ongoing in the past. The guests' arrival interrupts this ongoing action. 3) Mary was watching TV while her little brother was playing with the kitten. - In this sentence, we use the past continuous tense "was" for the verb "watch" because the action of watching TV was ongoing in the past. Simultaneously, her little brother was playing with the kitten. 4) I had eaten my lunch before he came. - In this sentence, we use the past perfect tense "had eaten" for the verb "eat" to indicate that the action of eating lunch was completed before the action of him coming. 5) How long had you studied French before you first visited France? - In this sentence, we use the past perfect tense "had studied" for the verb "study" to indicate that the action of studying French was completed before the action of first visiting France. 6) "Lisa was exhausted yesterday." - "I know. She had been studying for a history exam all day." - In this conversation, we use the past perfect continuous tense "had been studying" for the verb "study" to show that the action of studying was ongoing for a period of time before a certain point in the past. 7) Kate went out with her friends after she had finished her homework. - In this sentence, we use the past simple tense "went" for the verb "go" and the past perfect tense "had finished" for the verb "finish" to indicate that the action of finishing homework was completed before the action of going out with friends. 8) Dr. Stephens had performed a lot of experiments before he made an important discovery. - In this sentence, we use the past perfect tense "had performed" for the verb "perform" to indicate that the action of performing experiments was completed before the action of making an important discovery. 9) How long had you been waiting before the bus arrived? - In this sentence, we use the past perfect continuous tense "had been waiting" for the verb "wait" to show that the action of waiting was ongoing for a period of time before a certain point in the past. 10) I had been dreaming about this camera all my life. - In this sentence, we use the past perfect continuous tense "had been dreaming" for the verb "dream" to show that the action of dreaming was ongoing for a period of time before a certain point in the past.