| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [prep] [num] years | 22 |
|
| 2 | [modal v] [be] [prep] [num] years | 22 |
|
| 3 | [modal v] [be] for [num] [noun] | 21 |
|
| 4 | [modal v] [be] for [num] [noun pl] | 13 |
|
| 5 | [modal v] [be] for [num] year | 11 |
|
| 6 | [modal v] [be] for [adj] years | 7 |
|
| 7 | [modal v] [be] for [num] years | 7 |
|
