SN4 ""

No	Pattern	Freq
1	[noun] it is [adj] [to-vb] that	124
2	[noun sg] it is [adj] [verb] that	88
3	[noun pl] it is [adj] [verb] that	29
4	[noun] it is [adj] note that	21
5	[noun] it is [adj] to note that	21
6	[noun] it is important [verb] that	20
7	[noun] it is possible [verb] that	15
8	[noun] it is easy [verb] that	13
9	[noun] it is sufficient [verb] that	11
10	[noun] it is [adj] to say that	10
11	[noun] it is [adj] say that	10
12	[noun] it is [adj] to assume that	9
13	[noun] it is [adj] assume that	9
14	[noun] it is [adj] see that	8
15	[noun] it is reasonable [verb] that	8
16	[noun] it is [adj] to see that	8
17	[noun prp] it is [adj] [verb] that	7
18	[noun] it is necessary [verb] that	7
19	[noun] it is difficult [verb] that	7
20	[noun] it is [adj] to show that	7
21	purpose it is [adj] [verb] that	7
22	[noun] it is [adj] show that	7
23	[noun] it is interesting [verb] that	7
24	[noun] it is [adj] to ensure that	6
25	[noun] it is [adj] ensure that	6
26	[noun] it is [adj] believe that	5
27	[noun] it is [adj] to believe that	5
28	point it is [adj] [verb] that	5
29	point it is [adj] [verb] that	5
30	purposes it is [adj] [verb] that	5