SN4 ""

No	Pattern	Freq
1	it be [adj] that [adj]	516
2	it [be] [adj] that [adj]	515
3	it [is] [adj] that [adj]	460
4	it is [adj] that [adj]	446
5	it [be] clear that [adj]	88
6	it [be] clear that [adj]	88
7	it [was/were] [adj] that [adj]	56
8	it [be] possible that [adj]	56
9	it [be] possible that [adj]	56
10	it was [adj] that [adj]	56
11	it [be] likely that [adj]	51
12	it [be] likely that [adj]	51
13	it [be] true that [adj]	46
14	it [be] true that [adj]	46
15	it [be] important that [adj]	42
16	it [be] important that [adj]	42
17	it [be] unlikely that [adj]	25
18	it [be] unlikely that [adj]	25
19	it [be] essential that [adj]	22
20	it [be] [adj] that other	22
21	it [be] essential that [adj]	22
22	it [be] [adj] that certain	20
23	it [be] [adj] that local	19
24	it [be] obvious that [adj]	17
25	it [be] obvious that [adj]	17
26	it [be] evident that [adj]	16
27	it [be] evident that [adj]	16
28	it [be] vital that [adj]	14
29	it 's [adj] that [adj]	14
30	it [be] vital that [adj]	14