SN4 ""

No	Pattern	Freq
1	[verb] [vb pp] for years	112
2	have [vb pp] for years	111
3	be [vb pp] for years	59
4	[vb base] [vb pp] for years	59
5	[be] [vb pp] for years	59
6	[adv] [vb pp] for years	41
7	[been] [vb pp] for years	39
8	been [vb pp] for years	39
9	have [vb pp] for years	34
10	[vb past] [vb pp] for years	31
11	not [vb pp] for years	30
12	[not/n't] [vb pp] for years	30
13	had [vb pp] for years	26
14	've [vb pp] for years	25
15	n't [vb pp] for years	18
16	[vb -s] [vb pp] for years	16
17	has [vb pp] for years	14
18	not [vb pp] for years	12
19	[adv] [vb pp] for years	11
20	be [vb pp] for years	10
21	[be] [vb pp] for years	10
22	[conj] [vb pp] for years	10
23	[coord] [vb pp] for years	9
24	and [vb pp] for years	9
25	and [vb pp] for years	9
26	[noun] [vb pp] for years	7
27	[was/were] [vb pp] for years	6
28	'd [vb pp] for years	5
29	was [vb pp] for years	5
30	[noun sg] [vb pp] for years	5