SN4 ""

No	Pattern	Freq
1	it is important [to-vb] that	482
2	it is [adj] to note that	308
3	it is [adj] to say that	189
4	it is interesting [to-vb] that	183
5	it is [adj] to remember that	131
6	it is [adj] to assume that	110
7	it is [adj] to believe that	108
8	it is easy [to-vb] that	102
9	it is reasonable [to-vb] that	99
10	it is difficult [to-vb] that	97
11	it is fair [to-vb] that	88
12	it is hard [to-vb] that	77
13	it is possible [to-vb] that	73
14	it is [adj] to see that	72
15	it is [adj] to ensure that	56
16	it is [adj] to realise that	52
17	it is [adj] to know that	45
18	it is [adj] to imagine that	43
19	it is necessary [to-vb] that	43
20	it is [adj] to suppose that	42
21	it is [adj] to think that	40
22	it is true [to-vb] that	38
23	it is tempting [to-vb] that	33
24	it is sufficient [to-vb] that	33
25	it is [adj] to argue that	31
26	it is [adj] to recognize that	31
27	it is [adj] to stress that	30
28	it is [adj] to suggest that	29
29	it is [adj] to realize that	27
30	it is safe [to-vb] that	27