SN4 ""

No	Pattern	Freq
1	[modal v] have been [vb pp] years	6
2	[vb mod] have been [vb pp] years	6
3	have been [vb pp] [adj] years	71
4	have been [vb pp] [num] years	55
5	have been [vb pp] [prep] years	38
6	have been [vb pp] [prep] years	38
7	have been [vb pp] for years	28
8	have been [vb pp] for years	28
9	have been [vb pp] [det] years	16
10	have been [vb pp] two years	15
11	have been [vb pp] two years	15
12	have been [vb pp] some years	8
13	have been [vb pp] some years	8
14	have been [vb pp] ten years	7
15	have been [vb pp] ten years	7
16	have been [vb pp] [adv] years	6
17	have been [vb pp] four years	5
18	have been [vb pp] five years	5
19	have been [vb pp] [adv prt] years	5
20	have been [vb pp] four years	5
21	have been [vb pp] five years	5
22	have been [vb pp] years [adv]	10
23	have been [vb pp] years [adv]	10
24	have been [vb pp] years ago	7
25	have been [vb pp] years ago	7