SN4 ""

No	Pattern	Freq
1	must be [vb pp] [prep]	4919
2	must be [vb pp] in	917
3	must be [vb pp] by	795
4	must be [vb pp] to	682
5	must be [vb pp] with	396
6	must be [vb pp] for	322
7	must be [vb pp] on	262
8	must be made [prep]	253
9	must be [vb pp] at	229
10	must be [vb pp] as	226
11	must be [vb pp] into	195
12	must be [vb pp] from	189
13	must be taken [prep]	180
14	must be seen [prep]	131
15	must be [vb pp] within	109
16	must be given [prep]	109
17	must be [vb pp] of	96
18	must be [vb pp] before	82
19	must be paid [prep]	81
20	must be [vb pp] against	79
21	must be done [prep]	68
22	must be used [prep]	68
23	must be accompanied [prep]	66
24	must be based [prep]	65
25	must be [vb pp] between	56
26	must be borne [prep]	56
27	must be treated [prep]	55
28	must be considered [prep]	54
29	must be kept [prep]	52
30	must be sent [prep]	49