| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [adv] be [verb] at | 95 |
|
| 2 | [vb -s] [adv] be [v-ing] [prep] | 87 |
|
| 3 | [verb] [adv] be [v-ing] at | 41 |
|
| 4 | [vb -s] [adv] [be] [v-ing] at | 6 |
|
