SN4 ""

No	Pattern	Freq
1	[subord] it is [vb pp] that [adj]	89
2	[subord] it is [vb pp] that [det]	52
3	[subord] it is [vb pp] that [adj]	31
4	if it is [vb pp] that [adj]	31
5	[subord] it is [vb pp] that such	10
6	[subord] it is [vb pp] that some	10
7	[subord] it is [vb pp] that some	10
8	[subord] it is [vb pp] that such	10
9	[subord] it is [vb pp] that these	8
10	[subord] it is [vb pp] that these	8
11	when it is [vb pp] that [adj]	8
12	[subord] it is [vb pp] that this	7
13	though it is [vb pp] that [adj]	7
14	[subord] it is accepted that [adj]	7
15	[subord] it is assumed that [adj]	7
16	although it is [vb pp] that [adj]	7
17	[subord] it is [vb pp] that this	7
18	where it is [vb pp] that [adj]	7
19	[subord] it is recognised that [adj]	6
20	[subord] it is felt that [adj]	6
21	[subord] it is known that [adj]	6
22	[subord] it is [vb pp] that [num]	5
23	while it is [vb pp] that [adj]	5
24	[subord] it is realised that [adj]	5
25	[subord] it is said that [adj]	5
26	as it is [vb pp] that [adj]	5