SN4 ""

No	Pattern	Freq
1	it be [adv] [verb] that [noun]	382
2	it [be] [adv] [vb pp] that [noun]	370
3	it [is] [adv] [verb] that [noun]	221
4	it is [adv] [verb] that [noun]	207
5	it [was/were] [adv] [verb] that [noun]	160
6	it was [adv] [verb] that [noun]	160
7	it [be] [adv] [verb] that [noun prp]	156
8	it [be] [adv] [verb] that [noun pl]	116
9	it [be] [adv] [verb] that [noun sg]	96
10	it [be] also [verb] that [noun]	65
11	it [be] [adv] known that [noun]	52
12	it [be] [adv] know that [noun]	52
13	it [be] well [verb] that [noun]	52
14	it [be] often [verb] that [noun]	43
15	it [be] widely [verb] that [noun]	42
16	it [be] generally [verb] that [noun]	40
17	it [be] [adv] say that [noun]	33
18	it [be] [adv] believed that [noun]	33
19	it [be] [adv] said that [noun]	33
20	it [be] [adv] believe that [noun]	33
21	it [be] [adv] assumed that [noun]	30
22	it [be] [adv] assume that [noun]	30
23	it [be] sometimes [verb] that [noun]	20
24	it [be] [adv] agree that [noun]	19
25	it [be] [adv] agreed that [noun]	19
26	it [be] now [verb] that [noun]	18
27	it [be] [adv] argue that [noun]	18
28	it [be] [adv] argued that [noun]	18
29	it 's [adv] [verb] that [noun]	14
30	it [be] [adv] claimed that [noun]	13