| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] a | 7860 |
|
| 2 | [verb] be [v-ing] [prep] | 6304 |
|
| 3 | [verb] [v-ing] [prep] a | 1401 |
|
| 4 | [verb] be [prep] a | 1105 |
|
| 5 | [verb] be [v-ing] a | 981 |
|
