SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] [to-vb] that	541
2	it is [adv] [adj] [verb] that	422
3	it is [adv] [adj] say that	134
4	it is [adv] [adj] to say that	134
5	it is not [adj] [verb] that	121
6	it is [not/n't] [adj] [verb] that	121
7	it is not [adj] [verb] that	118
8	it is also [adj] [verb] that	89
9	it is also [adj] [verb] that	89
10	it is [adv] important [verb] that	69
11	it is [adv] true [verb] that	65
12	it is probably [adj] [verb] that	47
13	it is probably [adj] [verb] that	47
14	it is [adv] [adj] note that	42
15	it is [adv] [adj] to note that	41
16	it is [adv] fair [verb] that	40
17	it is [adv] possible [verb] that	32
18	it is [adv] [adj] find that	30
19	it is [adv] [adj] to find that	30
20	it is [adv] difficult [verb] that	28
21	it is [adv] [adj] assume that	28
22	it is [adv] [adj] to assume that	28
23	it is [adv] surprising [verb] that	26
24	it is very [adj] [verb] that	25
25	it is very [adj] [verb] that	25
26	it is perhaps [adj] [verb] that	24
27	it is perhaps [adj] [verb] that	24
28	it is [adv] necessary [verb] that	24
29	it is therefore [adj] [verb] that	23
30	it is [adv] [adj] to suggest that	23