SN4 ""

No	Pattern	Freq
1	[subord] it is [adv] [verb] that	73
2	[subord] it is [adv] [vb pp] that	72
3	although it is [adv] [verb] that	18
4	[subord] it is well [verb] that	13
5	[subord] it is generally [verb] that	13
6	[subord] it is [adv] known that	11
7	[subord] it is [adv] know that	11
8	as it is [adv] [verb] that	10
9	[subord] it is now [verb] that	10
10	[subord] it is [adv] accept that	8
11	though it is [adv] [verb] that	8
12	[subord] it is [adv] accepted that	8
13	[subord] it is [adv] recognised that	7
14	[subord] it is [adv] recognise that	7
15	because it is [adv] [verb] that	6
16	[subord] it is widely [verb] that	6
17	[subord] it is often [verb] that	6
18	since it is [adv] [verb] that	6
19	if it is [adv] [verb] that	6
20	[subord] it is [adv] assume that	5
21	[subord] it is [adv] assumed that	5