| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who had [be] [prep] | 319 |
|
| 2 | had [be] working [prep] | 156 |
|
| 3 | who [be] working [prep] | 141 |
|
| 4 | who had [be] working | 16 |
|
