SN4 ""

No	Pattern	Freq
1	it is [adj] that [noun]	1302
2	it is [adj] that [noun prp]	452
3	it is [adj] that [noun pl]	419
4	it is [adj] that [noun sg]	381
5	it is clear that [noun]	217
6	it is clear that [noun]	217
7	it is true that [noun]	142
8	it is true that [noun]	142
9	it is likely that [noun]	121
10	it is likely that [noun]	121
11	it is possible that [noun]	111
12	it is possible that [noun]	111
13	it is important that [noun]	100
14	it is important that [noun]	100
15	it is unlikely that [noun]	70
16	it is unlikely that [noun]	70
17	it is essential that [noun]	55
18	it is essential that [noun]	55
19	it is [adj] that [n mass]	44
20	it is interesting that [noun]	42
21	it is interesting that [noun]	42
22	it is probable that [noun]	38
23	it is probable that [noun]	38
24	it is evident that [noun]	34
25	it is evident that [noun]	34
26	it is vital that [noun]	32
27	it is vital that [noun]	32
28	it is obvious that [noun]	30
29	it is obvious that [noun]	30
30	it is [adj] that people	29