SN4 ""

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