SN4 ""

No	Pattern	Freq
1	[conj] it is [adv] [vb pp] that	184
2	[coord] it is [adv] [vb pp] that	103
3	[subord] it is [adv] [vb pp] that	72
4	and it is [adv] [vb pp] that	59
5	and it is [adv] [vb pp] that	59
6	but it is [adv] [vb pp] that	44
7	but it is [adv] [vb pp] that	44
8	[conj] it is generally [vb pp] that	37
9	[conj] it is now [vb pp] that	29
10	[conj] it is [adv] known that	27
11	[conj] it is well [vb pp] that	22
12	[conj] it is [adv] accepted that	18
13	although it is [adv] [vb pp] that	18
14	although it is [adv] [vb pp] that	18
15	[conj] it is [adv] recognised that	16
16	[conj] it is often [vb pp] that	14
17	[conj] it is [adv] assumed that	14
18	[conj] it is widely [vb pp] that	12
19	as it is [adv] [vb pp] that	10
20	as it is [adv] [vb pp] that	10
21	that it is [adv] [vb pp] that	9
22	[conj] it is [adv] believed that	9
23	[that] it is [adv] [vb pp] that	9
24	[conj] it is [adv] agreed that	9
25	that it is [adv] [vb pp] that	9
26	though it is [adv] [vb pp] that	8
27	though it is [adv] [vb pp] that	8
28	[conj] it is commonly [vb pp] that	7
29	[conj] it is also [vb pp] that	6
30	because it is [adv] [vb pp] that	6