SN4 ""

No	Pattern	Freq
1	it [is] [verb] that [noun]	574
2	it [is] [verb] that [noun]	574
3	it [is] [vb pp] that [noun]	546
4	it is [verb] that [noun]	540
5	it [is] [verb] that [noun pl]	245
6	it [is] [verb] that [noun prp]	175
7	it [is] [verb] that [noun sg]	129
8	it [is] say that [noun]	54
9	it [is] hope that [noun]	50
10	it [is] hoped that [noun]	50
11	it [is] said that [noun]	50
12	it [is] know that [noun]	38
13	it [is] known that [noun]	36
14	it 's [verb] that [noun]	34
15	it [is] suggest that [noun]	34
16	it [is] suggested that [noun]	33
17	it [is] argue that [noun]	32
18	it [is] assume that [noun]	31
19	it [is] assumed that [noun]	31
20	it [is] argued that [noun]	31
21	it [is] understand that [noun]	30
22	it [is] believe that [noun]	30
23	it [is] understood that [noun]	30
24	it [is] believed that [noun]	29
25	it [is] thought that [noun]	29
26	it [is] think that [noun]	29
27	it [is] expected that [noun]	23
28	it [is] expect that [noun]	23
29	it [is] [verb] that [n mass]	20
30	it [is] [v-ing] that [noun]	17