| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [prep] [adj] years ' duration | 49 |
|
| 2 | [be] [prep] [adj] years ' duration | 49 |
|
| 3 | [be] [prep] [num] years ' duration | 49 |
|
| 4 | [be] [prep] [adj] years ' duration | 49 |
|
| 5 | [be] of [adj] years ' duration | 48 |
|
| 6 | is [prep] [adj] years ' duration | 45 |
|
| 7 | [is] [prep] [adj] years ' duration | 45 |
|
| 8 | [be] [prep] three years ' duration | 24 |
|
| 9 | [be] [prep] three years ' duration | 24 |
|
| 10 | [be] [prep] four years ' duration | 18 |
|
| 11 | [be] [prep] four years ' duration | 18 |
|
| 12 | [be] [prep] two years ' duration | 7 |
|
| 13 | [be] [prep] two years ' duration | 7 |
|
