SN4 ""

No	Pattern	Freq
1	[conj] it [is] [adv] that [det]	8
2	it [is] [adj] [adv] that [det]	11
3	it [is] [adj] [adv] that [det]	11
4	it [is] [adv] [adv] that [det]	9
5	it [is] not [adv] that [det]	6
6	it [is] [not/n't] [adv] that [det]	6
7	it [is] not [adv] that [det]	6
8	it [is] [adv] [adj] that [det]	335
9	it [is] [adv] [adj] that [det]	334
10	it [is] [adv] [verb] that [det]	145
11	it [is] [adv] [vb pp] that [det]	136
12	it [is] [adv] true that [det]	37
13	it [is] [adv] true that [det]	37
14	it [is] [adv] possible that [det]	35
15	it [is] [adv] possible that [det]	35
16	it [is] [adv] clear that [det]	34
17	it [is] [adv] clear that [det]	34
18	it [is] [adv] likely that [det]	33
19	it [is] [adv] likely that [det]	33
20	it [is] [adv] unlikely that [det]	31
21	it [is] [adv] unlikely that [det]	31
22	it [is] [adv] important that [det]	23
23	it [is] [adv] important that [det]	23
24	it [is] [adv] surprising that [det]	19
25	it [is] [adv] surprising that [det]	19
26	it [is] [adv] assume that [det]	18
27	it [is] [adv] assumed that [det]	18
28	it [is] [adv] know that [det]	16
29	it [is] [adv] known that [det]	16
30	it [is] [adv] accepted that [det]	14