In the English Grammar Profile, B1 point 71 in the category of MODALITY is defined:
‘must’ with the following verb ellipted where the previous main verb is understood
*an ellipted subject is also B1.
PELIC STUDENT EXAMPLE:
[The] coach must have a capability to solve problems of teammates, just as business managers must.
Korean Female level 5 writing class
EXPERT EXAMPLE:
We can do this because we must.
We did an iWeb search for:
* * * must_VM .|!
*we have removed incorrectly tagged ‘must’ as a noun.
1 , IF YOU MUST. 213
Be prepared to take a cab, if you must.
3 DO WHAT YOU MUST. 61
4 IT IF YOU MUST. 53
5, BUT YOU MUST. 36
6, BUT I MUST. 36
7 UNLESS YOU ABSOLUTELY MUST. 34
And don’t upgrade your seat unless you absolutely must.
9, AS IT MUST. 31
10 IF YOU REALLY MUST. 30
11 YOU FEEL YOU MUST. 29
12, AND WE MUST. 28
13, BUT NEEDS MUST. 28
14, IF I MUST. 27
15 THEM IF YOU MUST. 27
16 IF YOU ABSOLUTELY MUST. 25
17 IT, YOU MUST. 25
18 ONLY IF YOU MUST. 25
19 YET, YOU MUST. 25
If you haven’t watched this intriguing story yet, you must.
20 YET, YOU MUST! 24
21 DO WHAT WE MUST. 24
22 , BUT WE MUST. 23
24 I FEEL I MUST. 21
25 , YOU REALLY MUST. 20
26 ( IF YOU MUST! 20
28 DO WHAT THEY MUST. 18
29 , THEN YOU MUST. 16
30 , IF YOU MUST! 16
32 DO WHAT I MUST. 15
33 SUFFER WHAT THEY MUST. 15
34 , IF WE MUST. 15
36 , YOU SIMPLY MUST. 14
37 , YOU SIMPLY MUST! 14
38 ME IF YOU MUST. 14
39 I KNOW I MUST. 14
40 I THINK YOU MUST. 13
42 , YOU ABSOLUTELY MUST. 12
43 IT, YOU MUST ! 12
44 ‘ IF YOU MUST. 12
45 . BUT I MUST. 12
46 THEY FEEL THEY MUST. 11
A2 vocabulary: if, must, yet
B1: absolutely, unless
B2: simply, suffer