SN4 ""

No	Pattern	Freq
1	[noun] [prep] many years	887
2	[noun sg] [prep] many years	576
3	[verb] [prep] many years	437
4	[vb pp] [prep] many years	233
5	[noun pl] [prep] many years	188
6	[adv] [prep] many years	153
7	[noun prp] [prep] many years	113
8	[adv] [prep] many years	109
9	[adj] [prep] many years	93
10	[conj] [prep] many years	78
11	have [prep] many years	76
12	[pron] [prep] many years	76
13	[adj] [prep] many years	71
14	[vb past] [prep] many years	57
15	[be] [prep] many years	56
16	be [prep] many years	56
17	[coord] [prep] many years	53
18	[pers pn] [prep] many years	46
19	and [prep] many years	42
20	and [prep] many years	42
21	[vb -s] [prep] many years	41
22	[adv prt] [prep] many years	34
23	[vb base] [prep] many years	32
24	has [prep] many years	32
25	[vb infin] [prep] many years	30
26	[was/were] [prep] many years	28
27	[v-ing] [prep] many years	26
28	been [prep] many years	25
29	[been] [prep] many years	25
30	was [prep] many years	25