| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] [prep] | 27424 |
|
| 2 | [vb past] [v-ing] [prep] | 4396 |
|
| 3 | [vb past] [was/were] [prep] | 427 |
|
| 4 | [vb past] [was/were] [v-ing] | 190 |
|
