| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] should be | 20778 |
|
| 2 | [n mass] should be | 371 |
|
| 3 | aircraft [modal v] be | 66 |
|
| 4 | aircraft should be | 6 |
|
| 5 | aircraft should be | 6 |
|
| 6 | aircraft should [be] | 6 |
|
| 7 | aircraft should [be] | 6 |
|
