| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [be] [verb] | 23359 |
|
| 2 | [modal v] [be] extend | 472 |
|
| 3 | [vb mod] [be] extend | 472 |
|
| 4 | should [be] extend | 87 |
|
| 5 | should [be] extend | 87 |
|
