SN4 ""

No	Pattern	Freq
1	be [vb pp] [prep] four years	48
2	[be] [vb pp] [prep] four years	48
3	[was/were] [vb pp] [prep] four years	22
4	was [vb pp] [prep] four years	20
5	[be] [vb pp] [prep] four years	11
6	[verb] [vb pp] [prep] four years	11
7	be [vb pp] [prep] four years	11
8	have [vb pp] [prep] four years	11
9	[noun] [vb pp] [prep] four years	11
10	[noun sg] [vb pp] [prep] four years	10
11	[been] [vb pp] [prep] four years	8
12	been [vb pp] [prep] four years	8
13	[adv] [vb pp] [prep] four years	6
14	had [vb pp] [prep] four years	6
15	[vb past] [vb pp] [prep] four years	6
16	[am/are] [vb pp] [prep] four years	5
17	[adv] [vb pp] [prep] four years	5
18	[vb pp] [adv] [prep] four years	10
19	[vb pp] [adv] [prep] four years	7
20	[vb pp] [pron] [prep] four years	7
21	[vb pp] [pers pn] [prep] four years	6
22	[vb pp] [prep] [adv] four years	7
23	[vb pp] [prep] [adv] four years	7
24	[vb pp] [prep] [noun] four years	6
25	[vb pp] [prep] [noun prp] four years	6
26	[vb pp] [prep] the four years	5
27	[vb pp] [prep] [art] four years	5
28	[vb pp] [prep] the four years	5
29	[vb pp] [prep] [art] four years	5
30	[vb pp] [prep] four years [prep]	39