SN4 ""

No	Pattern	Freq
1	it [is] [adv] [adj] that [det]	334
2	it is [adv] [adj] that [det]	298
3	it [is] [adv] [adj] that this	69
4	it [is] [adv] [adj] that some	49
5	it [is] also [adj] that [det]	46
6	it [is] [adv] [adj] that many	44
7	it [is] [adv] true that [det]	37
8	it 's [adv] [adj] that [det]	37
9	it [is] [adv] true that [det]	37
10	it [is] [adv] possible that [det]	35
11	it [is] [adv] possible that [det]	35
12	it [is] [adv] clear that [det]	34
13	it [is] [adv] clear that [det]	34
14	it [is] [adv] likely that [det]	33
15	it [is] [adv] likely that [det]	33
16	it [is] [adv] [adj] that any	32
17	it [is] [adv] unlikely that [det]	31
18	it [is] [adv] unlikely that [det]	31
19	it [is] quite [adj] that [det]	30
20	it [is] very [adj] that [det]	25
21	it [is] [adv] [adj] that these	24
22	it [is] [adv] important that [det]	23
23	it [is] [adv] important that [det]	23
24	it [is] [adv] [adj] that such	22
25	it [is] [adv] [adj] that all	21
26	it [is] hardly [adj] that [det]	20
27	it [is] [adv] surprising that [det]	19
28	it [is] [adv] surprising that [det]	19
29	it [is] [adv] [adj] that most	15
30	it [is] [adv] [adj] that those	15