SN4 ""

No	Pattern	Freq
1	[pron] must be [prep] [pers pn]	10
2	[pers pn] must be [prep] [pers pn]	8
3	it must be [prep] [pers pn]	7
4	[noun] must be [prep] [pers pn]	7
5	it must be [prep] [pers pn]	7
6	must be [verb] [prep] [pers pn]	73
7	must be [adj] [prep] [pers pn]	72
8	must be [adj] [prep] [pers pn]	64
9	must be [vb pp] [prep] [pers pn]	58
10	must be [indef pn] [prep] [pers pn]	14
11	must be [v-ing] [prep] [pers pn]	14
12	must be [pron] [prep] [pers pn]	14
13	must be something [prep] [pers pn]	12
14	must be something [prep] [pers pn]	12
15	must be [adv] [prep] [pers pn]	11
16	must be [adv] [prep] [pers pn]	11
17	must be [noun] [prep] [pers pn]	11
18	must be [noun sg] [prep] [pers pn]	9
19	must be more [prep] [pers pn]	8
20	must be more [prep] [pers pn]	8
21	must be difficult [prep] [pers pn]	6
22	must be [num] [prep] [pers pn]	6
23	must be difficult [prep] [pers pn]	6
24	must be related [prep] [pers pn]	5
25	must be relate [prep] [pers pn]	5
26	must be [prep] [pers pn] [verb]	6
27	must be [prep] [pers pn] [to-vb]	5