| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] [be] [vb pp] clean | 12 |
|
| 2 | need [prep] [be] [vb pp] clean | 6 |
|
| 3 | [vb -s] [prep] [be] [vb pp] clean | 5 |
|
