| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] a | 1487 |
|
| 2 | [be] [v-ing] [det] | 1299 |
|
| 3 | [v-ing] a [det] | 752 |
|
| 4 | [be] a [det] | 148 |
|
