| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [be] [vb pp] | 495 |
|
| 2 | must also [be] [vb pp] | 299 |
|
| 3 | also have [be] [vb pp] | 81 |
|
| 4 | must also have [vb pp] | 37 |
|
| 5 | must also have [be] | 25 |
|
