SN4 ""

No	Pattern	Freq
1	it is [adj] [adv] that [adj]	11
2	it is [adj] [adv] that [adj]	11
3	it is [adv] [adv] that [adj]	10
4	it is not [adv] that [adj]	6
5	it is [not/n't] [adv] that [adj]	6
6	it is not [adv] that [adj]	6
7	[conj] it is [adv] that [adj]	8
8	[coord] it is [adv] that [adj]	5
9	it is [adv] [adj] that [adj]	475
10	it is [adv] [adj] that [adj]	473
11	it is [adv] [verb] that [adj]	249
12	it is [adv] [vb pp] that [adj]	240
13	it is [adv] likely that [adj]	53
14	it is [adv] likely that [adj]	52
15	it is [adv] possible that [adj]	48
16	it is [adv] possible that [adj]	48
17	it is [adv] clear that [adj]	47
18	it is [adv] clear that [adj]	47
19	it is [adv] true that [adj]	46
20	it is [adv] true that [adj]	46
21	it is [adv] surprising that [adj]	37
22	it is [adv] surprising that [adj]	37
23	it is [adv] unlikely that [adj]	36
24	it is [adv] unlikely that [adj]	36
25	it is [adv] important that [adj]	35
26	it is [adv] important that [adj]	35
27	it is [adv] know that [adj]	31
28	it is [adv] known that [adj]	31
29	it is [adv] assume that [adj]	26
30	it is [adv] assumed that [adj]	26