| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] of [num] year ['s] duration | 50 |
|
| 2 | [be] of [num] year ['s] duration | 50 |
|
| 3 | [be] of [num] year ['s] [noun sg] | 50 |
|
| 4 | be of [num] year ['s] [noun] | 50 |
|
| 5 | [be] of [num] years ['s] [noun] | 48 |
|
| 6 | [be] of [num] year ' [noun] | 48 |
|
| 7 | is of [num] year ['s] [noun] | 45 |
|
| 8 | [is] of [num] year ['s] [noun] | 45 |
|
| 9 | [be] of three year ['s] [noun] | 24 |
|
| 10 | [be] of four year ['s] [noun] | 17 |
|
| 11 | [be] of two year ['s] [noun] | 7 |
|
