SN4 ""

No	Pattern	Freq
1	have been [num] years	119
2	had been [adj] years	57
3	have been [adj] years	28
4	's been [adj] years	21
5	have been [adj] years	15
6	have been five years	15
7	have been five years	15
8	has been [adj] years	13
9	have been three years	12
10	have been three years	12
11	have been [det] years	11
12	have been ten years	11
13	have been ten years	11
14	have been [adj] years	10
15	have been four years	9
16	have been four years	9
17	've been [adj] years	7
18	have been many years	6
19	have been two years	6
20	have been many years	6
21	have been two years	6
22	have been thirty years	5
23	have been thirty years	5