SN4 ""

No	Pattern	Freq
1	[vb past] four years	85
2	[vb pp] four years	58
3	take four years	24
4	spend four years	22
5	have four years	14
6	spent four years	14
7	took four years	14
8	[to-vb] four years	13
9	[v-ing] four years	13
10	[vb infin] four years	10
11	[vb -s] four years	7
12	die four years	7
13	had four years	7
14	serve four years	7
15	[vb base] four years	7
16	spent four years	6
17	wait four years	6
18	died four years	6
19	begin four years	5
20	last four years	5