| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a | 27354 |
|
| 2 | were [v-ing] [prep] | 7412 |
|
| 3 | were [v-ing] a | 1183 |
|
| 4 | were [prep] a | 1094 |
|
