SN4 ""

No	Pattern	Freq
1	[conj] it [is] [adv] that [det]	9
2	it [is] [adj] [adv] that [det]	12
3	it [is] [adj] [adv] that [det]	12
4	it [is] [adv] [adv] that [det]	9
5	it [is] [vb pp] [adv] that [det]	6
6	it [is] [verb] [adv] that [det]	6
7	it [is] not [adv] that [det]	6
8	it [is] [not/n't] [adv] that [det]	6
9	it [is] not [adv] that [det]	6
10	it [is] [adv] [adj] that [det]	426
11	it [is] [adv] [adj] that [det]	425
12	it [is] [adv] [verb] that [det]	162
13	it [is] [adv] [vb pp] that [det]	152
14	it [is] [adv] surprising that [det]	74
15	it [is] [adv] surprising that [det]	74
16	it [is] [adv] clear that [det]	48
17	it [is] [adv] clear that [det]	48
18	it [is] [adv] true that [det]	42
19	it [is] [adv] true that [det]	42
20	it [is] [adv] likely that [det]	36
21	it [is] [adv] likely that [det]	36
22	it [is] [adv] possible that [det]	35
23	it [is] [adv] possible that [det]	35
24	it [is] [adv] unlikely that [det]	31
25	it [is] [adv] unlikely that [det]	31
26	it [is] [adv] important that [det]	23
27	it [is] [adv] important that [det]	23
28	it [is] [adv] assumed that [det]	18
29	it [is] [adv] assume that [det]	18
30	it [is] [adv] known that [det]	17