| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [prep] [adj] years | 140 |
|
| 2 | [vb infin] [prep] [adj] years ['s] | 7 |
|
| 3 | [modal v] [vb infin] [prep] [adj] ['s] | 7 |
|
| 4 | [modal v] [vb infin] [adj] years ['s] | 5 |
|
