| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] be [verb] at | 769 |
|
| 2 | [vb past] be working [prep] | 180 |
|
| 3 | [vb past] be working [prep] | 180 |
|
| 4 | [vb past] be [v-ing] at | 180 |
|
| 5 | [verb] be working at | 41 |
|
| 6 | [vb past] be work at | 21 |
|
| 7 | [vb past] [be] working at | 20 |
|
| 8 | [vb past] be working at | 20 |
|
