SN4 ""

No	Pattern	Freq
1	[noun] have been [vb pp] [prep] years	8
2	[noun pl] have been [vb pp] [prep] years	5
3	have been [vb pp] [prep] [adj] years	73
4	have been [vb pp] [prep] [adj] years	35
5	have been [vb pp] [prep] recent years	32
6	have been [vb pp] [prep] recent years	32
7	have been [vb pp] [prep] the years	29
8	have been [vb pp] [prep] the years	29
9	have been [vb pp] [prep] [art] years	29
10	have been [vb pp] [prep] [art] years	29
11	have been [vb pp] [prep] [det] years	21
12	have been [vb pp] [prep] [num] years	17
13	have been [vb pp] [prep] many years	17
14	have been [vb pp] [prep] many years	17
15	have been [vb pp] [prep] two years	7
16	have been [vb pp] [prep] two years	7
17	have been [vb pp] [prep] years [prep]	6
18	have been [vb pp] [prep] years [prep]	6