SN4 ""

No	Pattern	Freq
1	[noun] have been [vb pp] [det] years	6
2	[noun sg] have been [vb pp] [det] years	5
3	have been [vb pp] [prep] [det] years	82
4	have been [vb pp] [prep] [det] years	82
5	have been [vb pp] for [det] years	70
6	have been [vb pp] for [det] years	70
7	have been [vb pp] over [det] years	11
8	have been [vb pp] over [det] years	11
9	have been [vb pp] a [det] years	10
10	have been [vb pp] a [det] years	10
11	have been [vb pp] [art] [det] years	10
12	have been [vb pp] [art] [det] years	10
13	have been [vb pp] [det] years [adv]	11
14	have been [vb pp] [det] years [adv]	11