SN4 ""

No	Pattern	Freq
1	it [be] [adj] that a [noun]	203
2	it be [adj] that a [noun]	203
3	it [be] [adj] that a [noun]	200
4	it [be] [adj] that a [noun sg]	196
5	it [is] [adj] that a [noun]	177
6	it is [adj] that a [noun]	160
7	it was [adj] that a [noun]	26
8	it [was/were] [adj] that a [noun]	26
9	it [be] clear that a [noun]	21
10	it [be] clear that a [noun]	21
11	it [be] possible that a [noun]	20
12	it [be] possible that a [noun]	20
13	it [be] likely that a [noun]	18
14	it [be] likely that a [noun]	18
15	it 's [adj] that a [noun]	17
16	it [be] unlikely that a [noun]	12
17	it [be] unlikely that a [noun]	12
18	it [be] [adj] that a man	11
19	it [be] [adj] that a man	11
20	it [be] essential that a [noun]	9
21	it [be] essential that a [noun]	9
22	it [be] true that a [noun]	8
23	it [be] important that a [noun]	8
24	it [be] true that a [noun]	8
25	it [be] important that a [noun]	8
26	it [be] obvious that a [noun]	7
27	it [be] obvious that a [noun]	7
28	it [be] [adj] that a number	6
29	it [be] [adj] that a number	6
30	it [be] probable that a [noun]	6