SN4 ""

No	Pattern	Freq
1	[noun sg] must be [vb pp]	4161
2	[noun pl] must be [vb pp]	2099
3	[noun] must be made	436
4	[noun] must be taken	333
5	[noun] must be given	201
6	[noun prp] must be [vb pp]	180
7	care must be [vb pp]	151
8	care must be [vb pp]	151
9	[noun] must be considered	134
10	[noun] must be seen	112
11	[noun] must be kept	104
12	[noun] must be used	100
13	[n mass] must be [vb pp]	88
14	[noun] must be paid	75
15	[noun] must be found	72
16	[noun] must be allowed	68
17	[noun] must be set	66
18	application must be [vb pp]	54
19	[noun] must be provided	53
20	[noun] must be done	51
21	question must be [vb pp]	50
22	[noun] must be based	49
23	decision must be [vb pp]	45
24	[noun] must be treated	45
25	[noun] must be accompanied	45
26	[noun] must be obtained	45
27	[noun] must be carried	44
28	[noun] must be established	44
29	[noun] must be held	43
30	[noun] must be maintained	43