| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] [verb] | 7777 |
|
| 2 | be [v-ing] [prep] [vb infin] | 6415 |
|
| 3 | be [v-ing] [prep] buy | 98 |
|
| 4 | [be] [v-ing] [prep] buy | 61 |
|
| 5 | be [verb] [prep] buy | 61 |
|
