| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] [prep] [verb] | 1606 |
|
| 2 | [was/were] [v-ing] [prep] [vb infin] | 1178 |
|
| 3 | [be] [v-ing] [prep] buy | 61 |
|
| 4 | [was/were] [v-ing] [prep] buy | 27 |
|
| 5 | [was/were] [verb] [prep] buy | 21 |
|
