| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] be [v-ing] [prep] [art] | 611 |
|
| 2 | [conj] be [verb] at [art] | 258 |
|
| 3 | [conj] [be] [v-ing] at [art] | 52 |
|
| 4 | [conj] be [v-ing] at [art] | 52 |
|
