SN4 ""

No	Pattern	Freq
1	it is [adv] [verb] that [det]	141
2	it is [adv] [vb pp] that [det]	133
3	it is [adv] [verb] that this	39
4	it is generally [verb] that [det]	21
5	it is [adv] assumed that [det]	17
6	it is [adv] [verb] that such	17
7	it is [adv] assume that [det]	17
8	it is [adv] [verb] that these	16
9	it is [adv] known that [det]	16
10	it is [adv] know that [det]	16
11	it is [adv] [verb] that all	15
12	it is well [verb] that [det]	14
13	it is [adv] accept that [det]	14
14	it is [adv] accepted that [det]	14
15	it is often [verb] that [det]	13
16	it is [adv] [verb] that some	12
17	it is also [verb] that [det]	11
18	it is now [verb] that [det]	11
19	it is [adv] [verb] that many	11
20	it is [adv] said that [det]	10
21	it is [adv] say that [det]	10
22	it is sometimes [verb] that [det]	9
23	it is widely [verb] that [det]	8
24	it is [adv] [verb] that any	7
25	it is [adv] [verb] that most	7
26	it is [adv] agree that [det]	5
27	it is [adv] acknowledged that [det]	5
28	it is [adv] recognised that [det]	5
29	it is [adv] [verb] that that	5
30	it is [adv] recognise that [det]	5