| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] a | 29916 |
|
| 2 | be [v-ing] [adv] | 22743 |
|
| 3 | be [v-ing] a | 15939 |
|
| 4 | [v-ing] [adv] a | 1302 |
|
