SN4 ""

No	Pattern	Freq
1	it be [adv] [adj] [to-vb] that	669
2	it is [adv] [adj] [verb] that	543
3	it be [adv] [adj] [verb] that	525
4	it be [adv] [adj] to say that	158
5	it be [adv] [adj] say that	158
6	it be [not/n't] [adj] [verb] that	146
7	it be not [adj] [verb] that	146
8	it be not [adj] [verb] that	141
9	it be also [adj] [verb] that	108
10	it be also [adj] [verb] that	108
11	it be [adv] important [verb] that	79
12	it be [adv] true [verb] that	72
13	it was [adv] [adj] [verb] that	67
14	it 's [adv] [adj] [verb] that	59
15	it be probably [adj] [verb] that	52
16	it be probably [adj] [verb] that	52
17	it be [adv] fair [verb] that	45
18	it be [adv] [adj] note that	44
19	it be [adv] [adj] to note that	43
20	it be [adv] difficult [verb] that	39
21	it be [adv] possible [verb] that	39
22	it be very [adj] [verb] that	36
23	it be very [adj] [verb] that	36
24	it be [adv] [adj] find that	34
25	it be [adv] [adj] to find that	34
26	it be [adv] [adj] assume that	32
27	it be [adv] [adj] to assume that	32
28	it be [adv] surprising [verb] that	29
29	it be therefore [adj] [verb] that	27
30	it be [adv] [adj] see that	27