SN4 ""

No	Pattern	Freq
1	it have been [verb] [prep]	1975
2	it have been [vb pp] [prep]	1838
3	it has been [verb] [prep]	981
4	it had been [verb] [prep]	707
5	it have been [verb] by	484
6	it have been [verb] by	484
7	it have been [verb] in	309
8	it have been [verb] in	309
9	it 's been [verb] [prep]	261
10	it have been [verb] to	230
11	it have been [verb] to	230
12	it have been [verb] for	222
13	it have been [verb] for	222
14	it have been [v-ing] [prep]	131
15	it have been [verb] as	109
16	it have been [verb] as	109
17	it have been [verb] with	108
18	it have been [verb] with	108
19	it have been [verb] on	102
20	it have been [verb] on	102
21	it have been [verb] from	82
22	it have been [verb] from	82
23	it have been [verb] at	77
24	it have been [verb] at	77
25	it have been [verb] into	68
26	it have been [verb] into	68
27	it have been used [prep]	57
28	it have been use [prep]	57
29	it have been suggest [prep]	49
30	it have been know [prep]	49