| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at [noun prp] | 1999 |
|
| 2 | is [v-ing] at | 605 |
|
| 3 | is [v-ing] [noun prp] | 430 |
|
| 4 | is at [noun prp] | 202 |
|
