SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] [to-vb] that	420
2	it is [adv] [adj] to say that	134
3	it is [not/n't] [adj] [to-vb] that	121
4	it is not [adj] [to-vb] that	121
5	it is not [adj] [to-vb] that	118
6	it is also [adj] [to-vb] that	89
7	it is also [adj] [to-vb] that	89
8	it is [adv] important [to-vb] that	69
9	it is [adv] true [to-vb] that	65
10	it is probably [adj] [to-vb] that	47
11	it is probably [adj] [to-vb] that	47
12	it is [adv] [adj] to note that	41
13	it is [adv] fair [to-vb] that	40
14	it is [adv] possible [to-vb] that	32
15	it is [adv] [adj] to find that	30
16	it is [adv] difficult [to-vb] that	28
17	it is [adv] [adj] to assume that	28
18	it is [adv] surprising [to-vb] that	26
19	it is very [adj] [to-vb] that	25
20	it is very [adj] [to-vb] that	25
21	it is [adv] necessary [to-vb] that	24
22	it is perhaps [adj] [to-vb] that	23
23	it is perhaps [adj] [to-vb] that	23
24	it is [adv] [adj] to suggest that	23
25	it is therefore [adj] [to-vb] that	22
26	it is therefore [adj] [to-vb] that	22
27	it is [adv] [adj] to remember that	22
28	it is only [adj] [to-vb] that	21
29	it is only [adj] [to-vb] that	21
30	it is [adv] [adj] to ensure that	21