SN4 ""

No	Pattern	Freq
1	have been [vb pp] for [adj] years	162
2	has been [vb pp] [prep] [adj] years	147
3	have been [vb pp] [prep] [num] years	134
4	have been [vb pp] [prep] [adj] years	89
5	have been [vb pp] in [adj] years	88
6	have been [vb pp] [prep] [det] years	82
7	have been [vb pp] [prep] recent years	80
8	have been [vb pp] [prep] recent years	80
9	have been [vb pp] [prep] [adj] years	73
10	have been [vb pp] [prep] many years	62
11	have been [vb pp] [prep] many years	62
12	had been [vb pp] [prep] [adj] years	57
13	have been jailed [prep] [adj] years	26
14	have been [vb pp] to [adj] years	22
15	have been [vb pp] [prep] two years	22
16	have been [vb pp] [prep] two years	22
17	have been sentenced [prep] [adj] years	21
18	have been [vb pp] [prep] three years	18
19	have been [vb pp] [prep] three years	18
20	have been [vb pp] over [adj] years	17
21	have been known [prep] [adj] years	16
22	have been [vb pp] [prep] some years	15
23	have been used [prep] [adj] years	15
24	have been [vb pp] [prep] some years	15
25	have been [vb pp] [prep] seven years	11
26	have been [vb pp] [prep] seven years	11
27	have been made [prep] [adj] years	10
28	have been [vb pp] [prep] five years	9
29	have been developed [prep] [adj] years	9
30	have been [vb pp] [prep] five years	9