Fill in the gaps using the words in brackets in Past Simple. 1) She___(to have) to treat her immune system some years ago.
2) People___(can) use laptops or iPads in the 90s.
3) Jenny___(to have) throw a great party yesterday because she turned 30.
4) What___(to have) you to do in such situation?
5) I__(can) be very patient at the dentist's when a kid.
6) It started to rain and we__(to have) to return.
7) She___(to have) to experience insomnia last year.
8) They not___(to have) to work yesterday.
9) My granny not___(can) find the album with old photos.
10) Mike___(to have) buy medicine to cure his stomachache yesterday.​

can - could/ couldn't

to have(скорее всего have to правильно.)-had to /hadn't to.

1) She had to treat her immune system some years ago.
Explanation: In this sentence, we are talking about an action in the past that occurred before another action. The word "had" indicates that she was required or obliged to treat her immune system in the past.

2) People could use laptops or iPads in the 90s.
Explanation: "Could" is the past tense form of "can," and it indicates the ability or possibility to do something. In this sentence, we are referring to the ability of people to use laptops or iPads in the past, specifically in the 90s.

3) Jenny had to throw a great party yesterday because she turned 30.
Explanation: Again, "had" indicates that Jenny was required, compelled, or obligated to throw a great party due to her turning 30. The use of "had to" suggests that it was necessary for her to do this.

4) What did you have to do in such a situation?
Explanation: "Did" is used to form the past tense in questions and negations. In this question, we are asking someone about their past actions or obligations in a specific situation. "Have" indicates that there was a requirement or obligation for the person to do something.

5) I could be very patient at the dentist's when a kid.
Explanation: "Could" is used to express ability or possibility in the past. Here, the speaker is stating that they were able to be patient at the dentist's office when they were a child.

6) It started to rain and we had to return.
Explanation: "Had to" indicates a necessity or obligation in the past. Here, we are saying that due to the rain starting, it was necessary for us to return.

7) She had to experience insomnia last year.
Explanation: "Had to" implies that she was required or compelled to experience insomnia. This sentence suggests that experiencing insomnia was not her choice or desire but something she had to go through.

8) They did not have to work yesterday.
Explanation: "Did not have to" is the negative form of "had to" and implies the absence of a requirement or obligation. In this sentence, we are saying that they were not required or obliged to work yesterday.

9) My granny could not find the album with old photos.
Explanation: "Could not" is the negative form of "could" and indicates the absence of the ability or possibility to do something. Here, we are saying that the speaker's grandmother was unable to find the album with old photos.

10) Mike had to buy medicine to cure his stomachache yesterday.
Explanation: "Had to" suggests a requirement or obligation. In this sentence, we are stating that Mike was required to buy medicine to alleviate his stomachache in the past, specifically yesterday.