| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb past] [be] [v-ing] | 412 |
|
| 2 | they [be] [v-ing] at | 268 |
|
| 3 | [vb past] [be] [v-ing] at | 180 |
|
| 4 | they [vb past] [v-ing] at | 29 |
|
| 5 | they [vb past] [be] at | 23 |
|
