1 Answers
Option 1 : they arrive
Correct option - 1
Here, concept of conditional sentences is brought under consideration. Since, until used here as a conjunction to show condition of the context. When, until is used to denote future time. Then, present tense is used with until phrase. Hence, remove they have arrived with they arrive.
Correct sentence - His father won't be able to leave for Mumbai until they arrive.
4 views
Answered