SN4 ""

No	Pattern	Freq
1	it [be] [verb] down	224
2	it be [verb] down	224
3	it [be] [vb pp] down	125
4	it [was/were] [verb] down	119
5	it was [verb] down	109
6	it [is] [verb] down	98
7	it [be] [v-ing] down	88
8	it 's [verb] down	61
9	it is [verb] down	37
10	it [be] going down	17
11	it [be] go down	17
12	it [be] break down	14
13	it [be] come down	12
14	it [be] coming down	12
15	it [be] lay down	12
16	it were [verb] down	10
17	it [be] laid down	10
18	it [be] [to-vb] down	10
19	it [be] broken down	10
20	it [be] turn down	9
21	it [be] put down	8
22	it [be] put down	8
23	it [be] close down	8
24	it [be] turned down	8
25	it [be] pour down	7
26	it [be] fall down	7
27	it [be] written down	7
28	it [be] falling down	7
29	it [be] write down	7
30	it [be] pouring down	7