| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [v-ing] [prep] a | 239 |
|
| 2 | [be] [verb] [v-ing] [prep] a | 239 |
|
| 3 | been [verb] [verb] [prep] a | 181 |
|
| 4 | been [verb] [v-ing] [prep] [art] | 84 |
|
| 5 | [been] [verb] [v-ing] [prep] a | 29 |
|
