SN4 ""

No	Pattern	Freq
1	[noun] has [been] [verb] for years	10
2	[noun sg] has [been] [verb] for years	8
3	has [been] [verb] [adv] for years	14
4	has [been] [verb] [adv prt] for years	8
5	has [been] [verb] on for years	7
6	has [been] [verb] on for years	7
7	has [been] [verb] [adv] for years	6
8	has [been] [verb] for [adj] years	135
9	has [been] [verb] for [num] years	97
10	has [been] [verb] for [det] years	38
11	has [been] [verb] for many years	27
12	has [been] [verb] for many years	27
13	has [been] [verb] for three years	16
14	has [been] [verb] for three years	16
15	has [been] [verb] for two years	9
16	has [been] [verb] for two years	9
17	has [been] [verb] for some years	8
18	has [been] [verb] for some years	8
19	has [been] [verb] for five years	6
20	has [been] [verb] for five years	6
21	has [been] [verb] for seven years	6
22	has [been] [verb] for seven years	6
23	has [been] [verb] for 20 years	5
24	has [been] [verb] for 20 years	5
25	has [been] [verb] for 12 years	5
26	has [been] [verb] for eight years	5
27	has [been] [verb] for twenty years	5
28	has [been] [verb] for 12 years	5
29	has [been] [verb] for twenty years	5
30	has [been] [verb] for eight years	5