Question

2) Alex (must / had to) leave the party early yesterday. His parents didn't let him stay until late.​

Answer 1

Ответ: had to

Объяснение: он вынужден покинуть вечеринку, т.к. его заставляют родители. В таких случаях используется have to, а поскольку в данном случае прошедшее время, то используем had to

Answer 2

Both "must" and "had to" can be used in this context to convey the idea that Alex was required to leave the party early. However, there is a subtle difference in meaning between the two:

1. Alex must leave the party early yesterday. This sentence suggests that it was necessary for Alex to leave the party early, possibly due to some personal or external reasons. It emphasizes the requirement or obligation.

2. Alex had to leave the party early yesterday. This sentence also conveys the idea that Alex was required to leave the party early, but it might slightly emphasize the external circumstances or authority (such as his parents' decision) that compelled him to leave.

Both sentences are grammatically correct and convey a similar meaning, so you can choose the one that best fits the nuance you want to convey.