| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [be] [v-ing] at | 268 |
|
| 2 | [be] [v-ing] at [num] | 221 |
|
| 3 | they [be] [v-ing] [num] | 131 |
|
| 4 | they [be] at [num] | 8 |
|
