SN4 ""

No	Pattern	Freq
1	[conj] it is [adv] that it	5
2	it is [adv] [adj] that it	92
3	it is [adv] [adj] that it	91
4	it is [adv] [vb pp] that it	45
5	it is [adv] [verb] that it	45
6	it is [adv] surprising that it	13
7	it is [adv] surprising that it	13
8	it is [adv] clear that it	12
9	it is [adv] clear that it	12
10	it is [adv] unlikely that it	8
11	it is [adv] true that it	8
12	it is [adv] unlikely that it	8
13	it is [adv] true that it	8
14	it is [adv] likely that it	7
15	it is [adv] likely that it	7
16	it is [adv] argue that it	6
17	it is [adv] assumed that it	6
18	it is [adv] assume that it	6
19	it is [adv] argued that it	6
20	it is [adv] known that it	5
21	it is [adv] think that it	5
22	it is [adv] know that it	5
23	it is [adv] thought that it	5
24	it is [adv] that it [verb]	11
25	it is [adv] that it [vb -s]	10
26	it is [adv] that it [vb mod]	6
27	it is [adv] that it [modal v]	6
28	it is [adv] that it should	5
29	it is [adv] that it should	5