SN4 ""

No	Pattern	Freq
1	have been [vb pp] for years	28
2	[verb] been [vb pp] for years	28
3	[vb past] been [vb pp] for years	11
4	[adv] been [vb pp] for years	10
5	have been [vb pp] for years	10
6	[vb base] been [vb pp] for years	10
7	had been [vb pp] for years	10
8	[not/n't] been [vb pp] for years	9
9	not been [vb pp] for years	9
10	[vb -s] been [vb pp] for years	6
11	not been [vb pp] for years	5
12	has been [vb pp] for years	5
13	been [adv] [vb pp] for years	5
14	been [adv] [vb pp] for years	5
15	been [vb pp] for [adj] years	191
16	been [vb pp] for [num] years	114
17	been [vb pp] for [det] years	77
18	been [vb pp] for many years	54
19	been [vb pp] for many years	54
20	been [vb pp] for some years	17
21	been [vb pp] for some years	17
22	been [vb pp] for two years	17
23	been [vb pp] for two years	17
24	been [vb pp] for three years	16
25	been [vb pp] for three years	16
26	been [vb pp] for five years	8
27	been [vb pp] for seven years	8
28	been [vb pp] for seven years	8
29	been [vb pp] for five years	8
30	been [vb pp] for 12 years	7