| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [be] [v-ing] [prep] | 1919 |
|
| 2 | who [be] [v-ing] [prep] | 1732 |
|
| 3 | who had [be] [v-ing] | 470 |
|
| 4 | who had [be] [prep] | 319 |
|
