| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [prep] [num] year | 23 |
|
| 2 | [modal v] be [vb pp] for [num] year | 23 |
|
| 3 | should be [vb pp] [prep] [num] year | 23 |
|
| 4 | should be [vb pp] for [num] [noun] | 13 |
|
| 5 | should be [vb pp] for [num] year | 6 |
|
| 6 | should be [vb pp] for [adj] year | 6 |
|
| 7 | should [be] [vb pp] for [num] year | 6 |
|
| 8 | should be [verb] for [num] year | 6 |
|
