SN4 ""

No	Pattern	Freq
1	[noun] have been [vb pp] for years	16
2	[noun sg] have been [vb pp] for years	9
3	[noun pl] have been [vb pp] for years	5
4	have [adv] been [vb pp] for years	10
5	have [not/n't] been [vb pp] for years	9
6	have not been [vb pp] for years	9
7	have not been [vb pp] for years	5
8	have been [vb pp] for [adj] years	162
9	have been [vb pp] for [num] years	92
10	have been [vb pp] for [det] years	70
11	have been [vb pp] for many years	50
12	have been [vb pp] for many years	50
13	have been [vb pp] for some years	15
14	have been [vb pp] for two years	15
15	have been [vb pp] for some years	15
16	have been [vb pp] for two years	15
17	have been [vb pp] for three years	14
18	have been [vb pp] for three years	14
19	have been [vb pp] for seven years	8
20	have been [vb pp] for seven years	8
21	have been [vb pp] for five years	7
22	have been [vb pp] for five years	7
23	have been [vb pp] for several years	5
24	have been [vb pp] for 12 years	5
25	have been [vb pp] for 12 years	5
26	have been [vb pp] for several years	5
27	have been [vb pp] for years [prep]	9
28	have been [vb pp] for years [prep]	9