| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [prep] four year ['s] duration | 18 |
|
| 2 | [be] [prep] four year ['s] [noun sg] | 18 |
|
| 3 | be [prep] four year ['s] [noun] | 18 |
|
| 4 | [be] [prep] four years ['s] [noun] | 18 |
|
| 5 | [be] [prep] four year ['s] duration | 18 |
|
| 6 | [be] [prep] four year ' [noun] | 18 |
|
| 7 | [be] of four year ['s] [noun] | 17 |
|
| 8 | [is] [prep] four year ['s] [noun] | 15 |
|
| 9 | is [prep] four year ['s] [noun] | 15 |
|
