SN4 ""

No	Pattern	Freq
1	it be [adv] [adj] that [det]	399
2	it [is] [adv] [adj] that [det]	334
3	it is [adv] [adj] that [det]	297
4	it [be] [adv] [adj] that this	88
5	it [was/were] [adv] [adj] that [det]	64
6	it was [adv] [adj] that [det]	63
7	it [be] [adv] [adj] that some	61
8	it [be] also [adj] that [det]	52
9	it [be] [adv] [adj] that many	49
10	it [be] [adv] clear that [det]	44
11	it [be] [adv] possible that [det]	40
12	it [be] [adv] true that [det]	39
13	it [be] [adv] likely that [det]	38
14	it 's [adv] [adj] that [det]	37
15	it [be] quite [adj] that [det]	35
16	it [be] [adv] [adj] that any	34
17	it [be] [adv] unlikely that [det]	33
18	it [be] very [adj] that [det]	29
19	it [be] hardly [adj] that [det]	29
20	it [be] [adv] [adj] that these	29
21	it [be] [adv] surprising that [det]	27
22	it [be] [adv] important that [det]	26
23	it [be] [adv] [adj] that such	26
24	it [be] [adv] [adj] that all	25
25	it [be] [adv] [adj] that most	18
26	it [be] [adv] [adj] that those	18
27	it [be] highly [adj] that [det]	17
28	it [be] most [adj] that [det]	14
29	it [be] now [adj] that [det]	13
30	it [be] certainly [adj] that [det]	12