SN4 ""

No	Pattern	Freq
1	it is [adv] that a [noun]	11
2	it is [adv] that a [noun sg]	11
3	it is [adv] that a [adj]	6
4	it is [adv] that a [adj]	6
5	it is [adv] [adv] that a	13
6	it is not [adv] that a	11
7	it is [not/n't] [adv] that a	11
8	it is not [adv] that a	10
9	it is [adv] [adj] that a	114
10	it is [adv] [adj] that a	114
11	it is [adv] [verb] that a	68
12	it is [adv] [vb pp] that a	68
13	it is [adv] likely that a	25
14	it is [adv] likely that a	25
15	it is [adv] possible that a	15
16	it is [adv] possible that a	15
17	it is [adv] unlikely that a	14
18	it is [adv] unlikely that a	14
19	it is [adv] true that a	10
20	it is [adv] true that a	10
21	it is [adv] surprising that a	7
22	it is [adv] argue that a	7
23	it is [adv] clear that a	7
24	it is [adv] argued that a	7
25	it is [adv] accept that a	7
26	it is [adv] surprising that a	7
27	it is [adv] accepted that a	7
28	it is [adv] clear that a	7
29	it is [adv] established that a	5
30	it is [adv] establish that a	5