| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] a | 13940 |
|
| 2 | [be] [v-ing] [num] | 1957 |
|
| 3 | [be] a [num] | 1854 |
|
| 4 | [v-ing] a [num] | 774 |
|
