| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | were [v-ing] [prep] | 7790 |
|
| 2 | [v-ing] ground [prep] | 91 |
|
| 3 | were ground [prep] | 7 |
|
| 4 | were [v-ing] ground | 7 |
|
