SN4 ""

No	Pattern	Freq
1	[conj] it [be] to be [adj]	61
2	[subord] it [be] to be [adj]	44
3	if it [be] to be [adj]	35
4	if it [be] to be [adj]	35
5	[adj] it [be] to be [adj]	28
6	[adj] it [be] to be [adj]	27
7	[pron] it [be] to be [adj]	18
8	what it [be] to be [adj]	17
9	what it [be] to be [adj]	17
10	[Wh det] it [be] to be [adj]	17
11	[coord] it [be] to be [adj]	13
12	but it [be] to be [adj]	7
13	but it [be] to be [adj]	7
14	likely it [be] to be [adj]	7
15	likely it [be] to be [adj]	7
16	and it [be] to be [adj]	6
17	and it [be] to be [adj]	6
18	[adv] it [be] to be [adj]	5
19	[adv] it [be] to be [adj]	5
20	it [be] [adj] to be [adj]	560
21	it [be] [adj] to be [adj]	518
22	it [be] [verb] to be [adj]	413
23	it [be] [v-ing] to be [adj]	231
24	it [be] go to be [adj]	222
25	it [be] going to be [adj]	222
26	it [be] [vb pp] to be [adj]	180
27	it [be] important to be [adj]	77
28	it [be] important to be [adj]	77
29	it [be] good to be [adj]	55
30	it [be] difficult to be [adj]	50