SN4 ""

No	Pattern	Freq
1	it be [verb] and	673
2	it [be] [verb] and	673
3	it [was/were] [verb] and	338
4	it was [verb] and	329
5	it [is] [verb] and	323
6	it [verb] [verb] and	275
7	it is [verb] and	243
8	it [modal v] [verb] and	218
9	it [vb mod] [verb] and	218
10	it [vb -s] [verb] and	176
11	it have [verb] and	147
12	it [adv] [verb] and	131
13	it [adv] [verb] and	125
14	it [vb past] [verb] and	92
15	it 's [verb] and	80
16	it [adj] [verb] and	72
17	it will [verb] and	71
18	it has [verb] and	62
19	it will [verb] and	57
20	it [adj] [verb] and	50
21	it can [verb] and	43
22	it can [verb] and	43
23	it 's [verb] and	42
24	it had [verb] and	42
25	it would [verb] and	35
26	it [pron] [verb] and	35
27	it [pers pn] [verb] and	34
28	it would [verb] and	33
29	it [conj] [verb] and	31
30	it [coord] [verb] and	22