SN4 ""

No	Pattern	Freq
1	[noun] have been [vb pp] [prep] years	21
2	[noun sg] have been [vb pp] [prep] years	13
3	[pron] have been [vb pp] [prep] years	7
4	[noun pl] have been [vb pp] [prep] years	6
5	[pers pn] have been [vb pp] [prep] years	5
6	have [adv] been [vb pp] [prep] years	13
7	have [not/n't] been [vb pp] [prep] years	11
8	have not been [vb pp] [prep] years	11
9	have not been [vb pp] [prep] years	7
10	have been [adv] [vb pp] [prep] years	5
11	have been [adv] [vb pp] [prep] years	5
12	have been [vb pp] [prep] [adj] years	308
13	have been [vb pp] [prep] [num] years	134
14	have been [vb pp] [prep] [adj] years	89
15	have been [vb pp] [prep] [det] years	82
16	have been [vb pp] [prep] recent years	80
17	have been [vb pp] [prep] recent years	80
18	have been [vb pp] [prep] many years	62
19	have been [vb pp] [prep] many years	62
20	have been [vb pp] [prep] the years	58
21	have been [vb pp] [prep] [art] years	58
22	have been [vb pp] [prep] the years	58
23	have been [vb pp] [prep] [art] years	58
24	have been [vb pp] [prep] two years	22
25	have been [vb pp] [prep] two years	22
26	have been [vb pp] [prep] three years	18
27	have been [vb pp] [prep] three years	18
28	have been [vb pp] [prep] some years	15
29	have been [vb pp] [prep] some years	15
30	have been [vb pp] [prep] seven years	11