| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [adv] a | 1087 |
|
| 2 | be [verb] [adv] a | 668 |
|
| 3 | be [v-ing] [adv] [art] | 552 |
|
| 4 | [be] [v-ing] [adv] a | 288 |
|
