| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [num] years when they | 5 |
|
| 2 | [noun sg] [prep] [num] years when they | 5 |
|
| 3 | [prep] [num] years when they [verb] | 6 |
|
| 4 | [prep] [num] years when they [vb past] | 5 |
|
