SN4 ""

No	Pattern	Freq
1	it is [adj] [to-vb] that [noun]	273
2	it is [adj] [verb] that [noun sg]	91
3	it is [adj] [verb] that [noun prp]	85
4	it is [adj] [verb] that [noun pl]	82
5	it is important [verb] that [noun]	72
6	it is [adj] note that [noun]	48
7	it is [adj] to note that [noun]	47
8	it is interesting [verb] that [noun]	29
9	it is [adj] to say that [noun]	29
10	it is [adj] say that [noun]	29
11	it is [adj] assume that [noun]	20
12	it is [adj] to believe that [noun]	19
13	it is [adj] to assume that [noun]	19
14	it is [adj] believe that [noun]	19
15	it is [adj] to remember that [noun]	18
16	it is [adj] remember that [noun]	18
17	it is difficult [verb] that [noun]	17
18	it is possible [verb] that [noun]	15
19	it is easy [verb] that [noun]	15
20	it is fair [verb] that [noun]	14
21	it is [adj] know that [noun]	11
22	it is hard [verb] that [noun]	11
23	it is [adj] imagine that [noun]	11
24	it is [adj] to know that [noun]	11
25	it is [adj] to imagine that [noun]	11
26	it is [adj] [verb] that [n mass]	10
27	it is reasonable [verb] that [noun]	10
28	it is [adj] realise that [noun]	10
29	it is [adj] to realise that [noun]	10
30	it is [adj] to ensure that [noun]	8