SN4 ""

No	Pattern	Freq
1	must be [vb pp] [adj]	218
2	must be made [adj]	82
3	must be [vb pp] [det]	49
4	must be kept [adj]	45
5	must be given [adj]	29
6	must be [vb pp] clear	21
7	must be [vb pp] clear	21
8	must be [vb pp] [num]	19
9	must be [vb pp] that	18
10	must be [vb pp] that	18
11	must be considered [adj]	17
12	must be [vb pp] [num ord]	17
13	must be [vb pp] available	15
14	must be [vb pp] first	15
15	must be [vb pp] first	15
16	must be [vb pp] available	15
17	must be [vb pp] aware	12
18	must be [vb pp] aware	12
19	must be held [adj]	9
20	must be [vb pp] prior	9
21	must be [vb pp] prior	9
22	must be [vb pp] some	8
23	must be added [adj]	8
24	must be [vb pp] some	8
25	must be [vb pp] clean	7
26	must be [vb pp] clean	7
27	must be [vb pp] one	6
28	must be [vb pp] one	6
29	must be [vb pp] two	6
30	must be [vb pp] two	6