SN4 ""

No	Pattern	Freq
1	[noun] [prep] three years	605
2	[noun sg] [prep] three years	444
3	[verb] [prep] three years	284
4	[vb pp] [prep] three years	166
5	[adj] [prep] three years	146
6	[adv] [prep] three years	141
7	[num] [prep] three years	102
8	[noun pl] [prep] three years	88
9	two [prep] three years	77
10	two [prep] three years	77
11	[adv] [prep] three years	72
12	[adv prt] [prep] three years	67
13	[noun prp] [prep] three years	58
14	up [prep] three years	51
15	up [prep] three years	51
16	period [prep] three years	47
17	[pron] [prep] three years	47
18	period [prep] three years	44
19	[be] [prep] three years	40
20	be [prep] three years	40
21	[vb past] [prep] three years	34
22	[v-ing] [prep] three years	33
23	time [prep] three years	32
24	[adj] [prep] three years	31
25	time [prep] three years	30
26	[conj] [prep] three years	30
27	[pers pn] [prep] three years	29
28	[is] [prep] three years	28
29	is [prep] three years	27
30	jail [prep] three years	21