SN4 ""

No	Pattern	Freq
1	it [is] [adv] [adj] that [det]	334
2	it is [adv] [adj] that [det]	297
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	43
7	it 's [adv] [adj] that [det]	37
8	it [is] [adv] true that [det]	37
9	it [is] [adv] possible that [det]	35
10	it [is] [adv] clear that [det]	34
11	it [is] [adv] likely that [det]	33
12	it [is] [adv] [adj] that any	32
13	it [is] [adv] unlikely that [det]	31
14	it [is] quite [adj] that [det]	30
15	it [is] very [adj] that [det]	25
16	it [is] [adv] [adj] that these	24
17	it [is] [adv] important that [det]	23
18	it [is] [adv] [adj] that such	22
19	it [is] [adv] [adj] that all	21
20	it [is] hardly [adj] that [det]	20
21	it [is] [adv] surprising that [det]	19
22	it [is] highly [adj] that [det]	15
23	it [is] [adv] [adj] that most	15
24	it [is] [adv] [adj] that those	15
25	it [is] most [adj] that [det]	14
26	it [is] now [adj] that [det]	12
27	it [is] [adv] essential that [det]	12
28	it [is] certainly [adj] that [det]	10
29	it [is] particularly [adj] that [det]	10
30	it [is] absolutely [adj] that [det]	10