SN4 ""

No	Pattern	Freq
1	it is [vb pp] that [noun]	518
2	it is [verb] that [noun pl]	232
3	it is [verb] that [noun prp]	164
4	it is [verb] that [noun sg]	121
5	it is say that [noun]	52
6	it is said that [noun]	48
7	it is hope that [noun]	44
8	it is hoped that [noun]	44
9	it is know that [noun]	36
10	it is known that [noun]	34
11	it is suggest that [noun]	34
12	it is suggested that [noun]	33
13	it is assume that [noun]	31
14	it is assumed that [noun]	31
15	it is argue that [noun]	30
16	it is argued that [noun]	29
17	it is believe that [noun]	28
18	it is understood that [noun]	28
19	it is understand that [noun]	28
20	it is believed that [noun]	27
21	it is think that [noun]	25
22	it is thought that [noun]	25
23	it is expect that [noun]	23
24	it is expected that [noun]	23
25	it is [verb] that [n mass]	18
26	it is recognised that [noun]	15
27	it is estimate that [noun]	15
28	it is estimated that [noun]	15
29	it is recognise that [noun]	15
30	it is recommended that [noun]	13