SN4 ""

No	Pattern	Freq
1	have already been [vb pp]	609
2	have also been [vb pp]	452
3	have now been [vb pp]	326
4	have all been [vb pp]	168
5	have recently been [vb pp]	165
6	have never been [vb pp]	156
7	have [adv] been made	123
8	have often been [vb pp]	109
9	have always been [vb pp]	97
10	have since been [vb pp]	86
11	have [adv] been used	83
12	have long been [vb pp]	77
13	have just been [vb pp]	68
14	have [adv] been found	65
15	have [adv] been given	60
16	have yet been [vb pp]	58
17	have traditionally been [vb pp]	54
18	have sometimes been [vb pp]	44
19	have [adv] been discussed	44
20	have [adv] been taken	42
21	have previously been [vb pp]	42
22	have [adv] been mentioned	40
23	have even been [vb pp]	39
24	have [adv] been published	39
25	have [adv] been reported	38
26	have [adv] been seen	38
27	have [adv] been identified	38
28	have actually been [vb pp]	37
29	have [adv] been described	37
30	have subsequently been [vb pp]	35