SN4 ""

No	Pattern	Freq
1	[conj] it is [verb] the [adj]	23
2	[subord] it is [verb] the [adj]	13
3	[noun] it is [verb] the [adj]	11
4	[adj] it is [verb] the [adj]	10
5	[adj] it is [verb] the [adj]	10
6	[noun sg] it is [verb] the [adj]	9
7	[verb] it is [verb] the [adj]	9
8	[adv] it is [verb] the [adj]	7
9	that it is [verb] the [adj]	6
10	[that] it is [verb] the [adj]	6
11	if it is [verb] the [adj]	6
12	that it is [verb] the [adj]	6
13	if it is [verb] the [adj]	6
14	it is [adj] [verb] the [adj]	445
15	it is [adj] [verb] the [adj]	424
16	it is possible [verb] the [adj]	68
17	it is possible [verb] the [adj]	68
18	it is important [verb] the [adj]	60
19	it is important [verb] the [adj]	60
20	it is necessary [verb] the [adj]	49
21	it is necessary [verb] the [adj]	49
22	it is [verb] [verb] the [adj]	44
23	it is difficult [verb] the [adj]	40
24	it is difficult [verb] the [adj]	40
25	it is [vb pp] [verb] the [adj]	37
26	it is easy [verb] the [adj]	25
27	it is impossible [verb] the [adj]	24
28	it is impossible [verb] the [adj]	24
29	it is interesting [verb] the [adj]	23
30	it is interesting [verb] the [adj]	23