SN4 ""

No	Pattern	Freq
1	it must be [verb]	1448
2	it must be [verb]	1448
3	it must be [verb]	1448
4	it must be [vb pp]	1391
5	it must be remembered	175
6	it must be remember	175
7	it must be said	170
8	it must be say	170
9	it must be stressed	69
10	it must be stress	69
11	it must be admit	61
12	it must be admitted	61
13	it must be [v-ing]	47
14	it must be noted	45
15	it must be note	45
16	it must be do	36
17	it must be recognised	33
18	it must be recognise	33
19	it must be bear	32
20	it must be emphasise	32
21	it must be done	32
22	it must be emphasised	32
23	it must be borne	31
24	it must be point	23
25	it must be pointed	23
26	it must be make	23
27	it must be made	21
28	it must be emphasize	19
29	it must be emphasized	19
30	it must be added	18