SN4 ""

No	Pattern	Freq
1	it have been [verb]	6114
2	it have [been] [verb]	6114
3	it have [been] [vb pp]	5668
4	it has [been] [verb]	3607
5	it had [been] [verb]	1683
6	it 's [been] [verb]	765
7	it have [been] suggest	516
8	it have [been] suggested	513
9	it have [been] [v-ing]	414
10	it have [been] argued	226
11	it have [been] argue	226
12	it have [been] show	213
13	it have [been] shown	212
14	it have [been] say	152
15	it have [been] said	152
16	it have [been] estimate	144
17	it have [been] estimated	144
18	it have [been] find	116
19	it have [been] found	114
20	it have [been] hold	113
21	it have [been] use	110
22	it have [been] used	109
23	it have [been] held	107
24	it have [been] make	100
25	it have [been] do	98
26	it have [been] made	93
27	it have [been] done	88
28	it have [been] decided	82
29	it have [been] decide	82
30	it have [been] claim	78