SN4 ""

No	Pattern	Freq
1	it must [adv] be [vb pp] that	104
2	it must [adv] be [verb] that	104
3	it must [adv] be [verb] that	75
4	it must also be [verb] that	46
5	it must also be [verb] that	46
6	it must [not/n't] be [verb] that	29
7	it must not be [verb] that	29
8	it must not be [verb] that	29
9	it must [adv] be remember that	17
10	it must [adv] be forget that	17
11	it must [adv] be remembered that	17
12	it must [adv] be forgotten that	17
13	it must [adv] be say that	12
14	it must [adv] be said that	12
15	it must [adv] be assumed that	8
16	it must [adv] be assume that	8
17	it must [adv] be thought that	7
18	it must [adv] be think that	7
19	it must [adv] be note that	7
20	it must always be [verb] that	7
21	it must [adv] be noted that	7
22	it must always be [verb] that	7
23	it must [adv] be recognised that	6
24	it must [adv] be emphasised that	6
25	it must [adv] be recognise that	6
26	it must [adv] be emphasise that	6
27	it must never be [verb] that	6
28	it must never be [verb] that	6