SN4 ""

No	Pattern	Freq
1	must be [verb] for	340
2	must be [verb] for	340
3	must be [vb pp] for	322
4	must be made for	36
5	must be make for	36
6	must be pay for	21
7	must be paid for	21
8	must be allow for	19
9	must be allowed for	19
10	must be [v-ing] for	17
11	must be prepare for	13
12	must be prepared for	13
13	must be find for	12
14	must be found for	12
15	must be specified for	10
16	must be specify for	10
17	must be use for	9
18	must be used for	9
19	must be look for	7
20	must be left for	7
21	must be account for	7
22	must be leave for	7
23	must be accounted for	7
24	must be keep for	6
25	must be kept for	6
26	must be retain for	5
27	must be punish for	5
28	must be preserve for	5
29	must be punished for	5
30	must be looking for	5