SN4 ""

No	Pattern	Freq
31	have [been] [verb] it for years	15
32	have [been] [verb] it for years	15
33	have [been] [verb] on for years	14
34	have [been] [verb] on for years	14
35	have [been] [verb] [noun] for years	10
36	have [been] [verb] [adj] for years	8
37	have [been] [verb] them for years	7
38	have [been] [verb] they for years	7
39	have [been] [verb] [prep] for years	6
40	have [been] [verb] [prep] for years	6
41	have [been] [verb] [noun sg] for years	5
42	have [been] [verb] [det] for years	5
43	have [been] [verb] for [adj] years	301
44	have [been] [verb] for [num] years	195
45	have [been] [verb] for [det] years	106
46	have [been] [verb] for many years	63
47	have [been] [verb] for many years	63
48	have [been] [verb] for two years	26
49	have [been] [verb] for two years	26
50	have [been] [verb] for three years	25
51	have [been] [verb] for three years	25
52	have [been] [verb] for some years	24
53	have [been] [verb] for some years	24
54	have [been] [verb] for several years	19
55	have [been] [verb] for several years	19
56	have [been] [verb] for five years	13
57	have [been] [verb] for five years	13
58	have [been] [verb] for seven years	12
59	have [been] [verb] for seven years	12
60	have [been] [verb] for ten years	9