3 Use the video explanation to circle the correct alternative for the rules. 1.We use the main verb before/after modal verbs.
2 We use must to/must for obligation.
3 Do/Do not add -s to the modal verb in the third person.
4 Use don't doesn't with have to/must for negative forms.
ответ: 4
Use don't doesn't with have to/must for negative forms.