| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [prep] [adj] years [unc] | 46 |
|
| 2 | [be] [prep] four years [unc] | 18 |
|
| 3 | [is] [prep] four [noun] [unc] | 16 |
|
| 4 | [is] [prep] four [noun pl] [unc] | 16 |
|
| 5 | [is] [prep] four years [unc] | 15 |
|
| 6 | [is] [prep] four year [unc] | 15 |
|
