SN4 ""

No	Pattern	Freq
1	it is [verb] that [adj]	211
2	it is [vb pp] that [adj]	209
3	it is hope that [adj]	22
4	it is hoped that [adj]	22
5	it is known that [adj]	15
6	it is know that [adj]	15
7	it is suggested that [adj]	14
8	it is suggest that [adj]	14
9	it is assumed that [adj]	13
10	it is argued that [adj]	13
11	it is argue that [adj]	13
12	it is assume that [adj]	13
13	it is [verb] that other	10
14	it is say that [adj]	10
15	it is thought that [adj]	10
16	it is [verb] that certain	10
17	it is think that [adj]	10
18	it is accepted that [adj]	9
19	it is accept that [adj]	9
20	it is believed that [adj]	9
21	it is believe that [adj]	9
22	it is said that [adj]	8
23	it is estimated that [adj]	7
24	it is claimed that [adj]	7
25	it is estimate that [adj]	7
26	it is recognised that [adj]	7
27	it is claim that [adj]	7
28	it is recognise that [adj]	7
29	it is expect that [adj]	6
30	it is envisaged that [adj]	6