SN4 ""

No	Pattern	Freq
1	have been [vb pp] by a	1446
2	have been [vb pp] by a	1198
3	had been [vb pp] by a	490
4	has been [vb pp] by a	435
5	have been [vb pp] by an	248
6	have been [vb pp] by a	195
7	have been [vb pp] by a	172
8	have been replaced by a	76
9	to have been [vb pp] by a	70
10	have been accompanied by a	42
11	have been caused by a	42
12	having been [vb pp] by a	32
13	have been hit by a	32
14	have been followed by a	28
15	have been made by a	23
16	's been [vb pp] by a	22
17	'd been [vb pp] by a	19
18	have been preceded by a	18
19	have been killed by a	18
20	have been written by a	17
21	have been approached by a	15
22	have been taken by a	14
23	have been used by a	12
24	have been created by a	11
25	have been developed by a	11
26	have been bought by a	11
27	have been told by a	9
28	have been confirmed by a	9
29	've been [vb pp] by a	9
30	have been superseded by a	9