SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] that	3236
2	it is [adv] [adj] that	3218
3	it is [adv] [verb] that	1289
4	it is [adv] [vb pp] that	1240
5	it is [adv] surprising that	566
6	it is [adv] surprising that	566
7	it is [adv] clear that	344
8	it is [adv] clear that	341
9	it is [adv] true that	285
10	it is [adv] true that	285
11	it is [adv] likely that	282
12	it is [adv] likely that	281
13	it is [adv] important that	251
14	it is [adv] important that	251
15	it is [adv] possible that	249
16	it is [adv] possible that	249
17	it is [adv] unlikely that	160
18	it is [adv] unlikely that	160
19	it is [adv] [adv] that	152
20	it is [adv] [adv] that	152
21	it is [adv] know that	149
22	it is [adv] known that	149
23	it is [adv] assume that	111
24	it is [adv] assumed that	111
25	it is [adv] say that	101
26	it is [adv] said that	99
27	it is [adv] certain that	94
28	it is [adv] certain that	94
29	it is [adv] accept that	88
30	it is [adv] accepted that	88