Part 1 Use the pictures below
With your neighbour, try to guess what it is, where it is taking place, who the people are, what might be happening or what might have happened to lead to the situation in the picture ..

• they must have drunk ... for people
• there must have been ... for events

Part 2  : exercises

intermediate
modals of deduction must, might, can’t
https://elt.oup.com/student/result/engint/a_grammar/unit07/7c_1?cc=global&selLanguage=en
choose between can’t, might or must
http://www.esl-lounge.com/student/grammar/4g3-modals-deduction-exercise.php
Modal verbs of deduction – must, might, could, can’t
https://www.test-english.com/grammar-points/b1/modal-verbs-of-deduction/
Modals Deduction in the Past 1
https://www.ecenglish.com/learnenglish/lessons/modals-deduction-past
Modals Deduction in the Past 2
http://www.autoenglish.org/modalverbs/pastmodalsdeduction.htm
Modals Deduction in the Past 3
https://elt.oup.com/student/result/engupp/a_grammar/unit06/6d?cc=gb&selLanguage=en