SN4 ""

No	Pattern	Freq
1	have [adv] been [vb pp] as	398
2	have [adv] [been] [vb pp] as	398
3	has [adv] [been] [vb pp] as	236
4	had [adv] [been] [vb pp] as	80
5	have [adv] [been] [vb pp] as	73
6	have long [been] [vb pp] as	63
7	have [adv] [been] regarded as	53
8	have [adv] [been] seen as	44
9	have always [been] [vb pp] as	42
10	have also [been] [vb pp] as	39
11	have often [been] [vb pp] as	35
12	have [adv] [been] used as	32
13	have already [been] [vb pp] as	30
14	have [adv] [been] known as	23
15	have recently [been] [vb pp] as	16
16	have [adv] [been] described as	14
17	have traditionally [been] [vb pp] as	14
18	have sometimes [been] [vb pp] as	14
19	have [adv] [been] identified as	13
20	have previously [been] [vb pp] as	13
21	have just [been] [vb pp] as	12
22	have never [been] [vb pp] as	11
23	have now [been] [vb pp] as	11
24	have [adv] [been] appointed as	10
25	have [adv] [been] recognised as	10
26	have [adv] [been] treated as	9
27	have all [been] [vb pp] as	8
28	have [adv] [been] recognized as	8
29	have [adv] [been] accepted as	7
30	have [adv] [been] established as	7