| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [noun sg] at | 236 |
|
| 2 | [vb -s] be [v-ing] [noun sg] | 236 |
|
| 3 | [vb -s] be [v-ing] at | 89 |
|
| 4 | [vb -s] [v-ing] [noun sg] at | 5 |
|
