SN4 ""

No	Pattern	Freq
1	it have been [verb] in	309
2	it have [been] [vb pp] in	293
3	it had [been] [verb] in	140
4	it has [been] [verb] in	136
5	it 's [been] [verb] in	26
6	it have [been] show in	17
7	it have [been] shown in	17
8	it have [been] [v-ing] in	16
9	it have [been] used in	14
10	it have [been] use in	14
11	it have [been] do in	10
12	it have [been] done in	9
13	it have [been] find in	8
14	it have [been] found in	8
15	it have [been] made in	7
16	it have [been] make in	7
17	it have [been] build in	6
18	it have [been] report in	6
19	it have [been] reported in	6
20	it have [been] hold in	6
21	it have [been] suggest in	6
22	it have [been] built in	6
23	it have [been] suggested in	6
24	it have [been] held in	6
25	it have [been] say in	5
26	it have [been] said in	5