SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] [that]	2591
2	it is [adv] [adj] [that]	2575
3	it is [adv] [verb] [that]	1206
4	it is [adv] [vb pp] [that]	1169
5	it is [adv] clear [that]	279
6	it is [adv] clear [that]	276
7	it is [adv] likely [that]	265
8	it is [adv] likely [that]	264
9	it is [adv] true [that]	256
10	it is [adv] true [that]	256
11	it is [adv] important [that]	250
12	it is [adv] important [that]	250
13	it is [adv] possible [that]	246
14	it is [adv] possible [that]	246
15	it is [adv] surprising [that]	199
16	it is [adv] surprising [that]	199
17	it is [adv] known [that]	147
18	it is [adv] know [that]	147
19	it is [adv] unlikely [that]	146
20	it is [adv] unlikely [that]	146
21	it is [adv] assumed [that]	109
22	it is [adv] assume [that]	109
23	it is [adv] say [that]	99
24	it is [adv] said [that]	98
25	it is [adv] accept [that]	88
26	it is [adv] accepted [that]	88
27	it is [adv] certain [that]	79
28	it is [adv] certain [that]	79
29	it is [adv] argued [that]	73
30	it is [adv] argue [that]	73