SN4 ""

No	Pattern	Freq
1	has been [vb pp] by	4288
2	had been [vb pp] by	3916
3	have been [vb pp] by	2308
4	have been [vb pp] by	1070
5	to have been [vb pp] by	515
6	have been replaced by	287
7	have been made by	258
8	having been [vb pp] by	233
9	have been caused by	191
10	have been used by	148
11	's been [vb pp] by	127
12	have been hit by	121
13	have been approved by	120
14	have been told by	116
15	have been influenced by	114
16	have been affected by	104
17	have been taken by	104
18	've been [vb pp] by	102
19	have been killed by	100
20	have been produced by	96
21	have been developed by	94
22	'd been [vb pp] by	89
23	have been provided by	87
24	have been accompanied by	83
25	have been adopted by	80
26	have been described by	78
27	have been followed by	76
28	have been achieved by	76
29	have been written by	72
30	have been created by	72