SN4 ""

No	Pattern	Freq
1	[noun] [prep] four years	324
2	[noun sg] [prep] four years	251
3	[verb] [prep] four years	144
4	[adj] [prep] four years	103
5	[adv] [prep] four years	85
6	[vb pp] [prep] four years	84
7	[num] [prep] four years	62
8	[adv prt] [prep] four years	46
9	three [prep] four years	43
10	three [prep] four years	43
11	[adv] [prep] four years	38
12	[noun pl] [prep] four years	34
13	[noun prp] [prep] four years	31
14	up [prep] four years	30
15	up [prep] four years	30
16	[pron] [prep] four years	24
17	[adj] [prep] four years	22
18	[be] [prep] four years	20
19	be [prep] four years	20
20	[pers pn] [prep] four years	19
21	[v-ing] [prep] four years	19
22	time [prep] four years	17
23	[vb past] [prep] four years	16
24	period [prep] four years	16
25	period [prep] four years	16
26	time [prep] four years	15
27	[is] [prep] four years	15
28	is [prep] four years	15
29	jail [prep] four years	15
30	sentence [prep] four years	14