SN4 ""

No	Pattern	Freq
1	[verb] it is [adj] that	160
2	[vb base] it is [adj] that	69
3	[vb -s] it is [adj] that	33
4	think it is [adj] that	32
5	[vb pp] it is [adj] that	32
6	think it is [adj] that	29
7	[verb] it is important that	24
8	[verb] it is important that	24
9	say it is [adj] that	19
10	[verb] it is likely that	18
11	[verb] it is likely that	18
12	says it is [adj] that	15
13	believe it is [adj] that	15
14	[verb] it is possible that	13
15	[verb] it is essential that	13
16	[verb] it is clear that	13
17	[verb] it is essential that	13
18	[verb] it is clear that	13
19	[verb] it is possible that	13
20	[verb] it is vital that	11
21	[verb] it is vital that	11
22	believe it is [adj] that	10
23	[verb] it is unlikely that	10
24	[verb] it is unlikely that	10
25	[v-ing] it is [adj] that	8
26	[vb infin] it is [adj] that	8
27	[to-vb] it is [adj] that	6
28	[vb past] it is [adj] that	6
29	do it is [adj] that	5
30	feel it is [adj] that	5