SN4 ""

No	Pattern	Freq
1	[noun] must be [vb pp] at	134
2	[noun sg] must be [vb pp] at	90
3	[pron] must be [vb pp] at	54
4	[noun pl] must be [vb pp] at	39
5	[pers pn] must be [vb pp] at	33
6	it must be [vb pp] at	25
7	it must be [vb pp] at	25
8	[Wh det] must be [vb pp] at	17
9	which must be [vb pp] at	16
10	which must be [vb pp] at	16
11	[adj] must be [vb pp] at	11
12	[det] must be [vb pp] at	11
13	this must be [vb pp] at	6
14	this must be [vb pp] at	6
15	they must be [vb pp] at	6
16	[conj] must be [vb pp] at	5
17	must [adv] be [vb pp] at	11
18	must [verb] be [vb pp] at	9
19	must have be [vb pp] at	9
20	must [vb infin] be [vb pp] at	9
21	must have be [vb pp] at	9
22	must [adv] be [vb pp] at	7
23	must be [vb pp] [prep] at	22
24	must be [vb pp] [prep] at	22
25	must be [vb pp] [adv] at	12
26	must be [vb pp] [conj] at	7
27	must be [vb pp] that at	6
28	must be [vb pp] for at	6
29	must be [vb pp] by at	6
30	must be [vb pp] for at	6