| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] [to-vb] | 4418 |
|
| 2 | is [v-ing] at | 605 |
|
| 3 | [v-ing] [to-vb] at | 551 |
|
| 4 | is [to-vb] at | 200 |
|
