SN4 ""

No	Pattern	Freq
1	have been [verb] [prep] [det] years	118
2	have be [verb] for [det] years	106
3	have be [vb pp] [prep] [det] years	82
4	have be [verb] [prep] many years	75
5	has be [verb] [prep] [det] years	44
6	had be [verb] [prep] [det] years	37
7	have be [v-ing] [prep] [det] years	36
8	have be [verb] [prep] [det] years	28
9	have be [verb] [prep] some years	24
10	have be [verb] [prep] several years	19
11	have be know [prep] [det] years	15
12	have be known [prep] [det] years	15
13	have be used [prep] [det] years	12
14	have be use [prep] [det] years	12
15	have be [verb] over [det] years	11
16	've be [verb] [prep] [det] years	5
17	have be established [prep] [det] years	5
18	have be establish [prep] [det] years	5