SN4 ""

No	Pattern	Freq
1	it is [adj] [to-vb] that [noun]	273
2	it [is] [adj] [to-vb] that [noun sg]	100
3	it [is] [adj] [to-vb] that [noun prp]	100
4	it [is] [adj] [to-vb] that [noun pl]	89
5	it [is] important [to-vb] that [noun]	76
6	it [is] [adj] to note that [noun]	47
7	it 's [adj] [to-vb] that [noun]	39
8	it [is] [adj] to say that [noun]	39
9	it [is] interesting [to-vb] that [noun]	29
10	it [is] [adj] to believe that [noun]	22
11	it [is] [adj] to remember that [noun]	21
12	it [is] [adj] to assume that [noun]	19
13	it [is] fair [to-vb] that [noun]	19
14	it [is] difficult [to-vb] that [noun]	17
15	it [is] easy [to-vb] that [noun]	16
16	it [is] possible [to-vb] that [noun]	15
17	it [is] [adj] [to-vb] that [n mass]	15
18	it [is] hard [to-vb] that [noun]	15
19	it [is] [adj] to know that [noun]	14
20	it [is] [adj] to see that [noun]	12
21	it [is] [adj] to realise that [noun]	11
22	it [is] [adj] to imagine that [noun]	11
23	it [is] good [to-vb] that [noun]	11
24	it [is] [adj] [to-vb] that people	11
25	it [is] [adj] [to-vb] that people	11
26	it [is] reasonable [to-vb] that [noun]	11
27	it [is] true [to-vb] that [noun]	10
28	it [is] [adj] to ensure that [noun]	8
29	it [is] [adj] [to-vb] that [letter]	8
30	it [is] [adj] to argue that [noun]	7