| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] a | 15939 |
|
| 2 | be a [num ord] | 814 |
|
| 3 | [v-ing] a [num ord] | 451 |
|
| 4 | be [v-ing] [num ord] | 408 |
|
