SN4 ""

No	Pattern	Freq
1	[conj] it must be [adj]	93
2	[coord] it must be [adj]	45
3	[verb] it must be [adj]	34
4	[adv] it must be [adj]	34
5	[adv] it must be [adj]	33
6	that it must be [adj]	30
7	[that] it must be [adj]	30
8	that it must be [adj]	30
9	but it must be [adj]	25
10	but it must be [adj]	25
11	[noun] it must be [adj]	21
12	and it must be [adj]	20
13	and it must be [adj]	20
14	[noun sg] it must be [adj]	19
15	[subord] it must be [adj]	18
16	[vb base] it must be [adj]	14
17	then it must be [adj]	13
18	then it must be [adj]	13
19	[adj] it must be [adj]	10
20	so it must be [adj]	8
21	so it must be [adj]	8
22	[vb past] it must be [adj]	7
23	know it must be [adj]	7
24	[adj] it must be [adj]	6
25	surely it must be [adj]	6
26	think it must be [adj]	6
27	surely it must be [adj]	6
28	[vb pp] it must be [adj]	5
29	it must [adv] be [adj]	42
30	it must [adv] be [adj]	36