| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] be [v-ing] [noun] at | 11 |
|
| 2 | [vb -s] been [v-ing] [noun] at | 11 |
|
| 3 | has be [v-ing] [noun] at | 9 |
|
| 4 | [vb -s] be [v-ing] [noun sg] at | 8 |
|
