SN4 ""

No	Pattern	Freq
1	have been [vb pp] for [adj] years	162
2	have been [vb pp] for [num] years	92
3	has been [vb pp] for [adj] years	78
4	have been [vb pp] for [det] years	70
5	have been [vb pp] for many years	50
6	have been [vb pp] for many years	50
7	had been [vb pp] for [adj] years	36
8	have been [vb pp] for [adj] years	30
9	have been jailed for [adj] years	26
10	have been known for [adj] years	16
11	have been [vb pp] for two years	15
12	have been [vb pp] for some years	15
13	have been [vb pp] for two years	15
14	have been [vb pp] for some years	15
15	have been [vb pp] for three years	14
16	have been [vb pp] for three years	14
17	have been used for [adj] years	12
18	have been [vb pp] for seven years	8
19	have been [vb pp] for seven years	8
20	have been [vb pp] for five years	7
21	have been [vb pp] for five years	7
22	've been [vb pp] for [adj] years	7
23	's been [vb pp] for [adj] years	6
24	have been separated for [adj] years	6
25	have been established for [adj] years	5
26	have been [vb pp] for several years	5
27	have been [vb pp] for several years	5
28	have been [vb pp] for 12 years	5
29	have been banned for [adj] years	5
30	have been [vb pp] for 12 years	5