| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] [v-ing] [prep] [art] | 785 |
|
| 2 | [be] [adv] [v-ing] at [art] | 260 |
|
| 3 | [is] [adv] [verb] at [art] | 215 |
|
| 4 | [is] [adv] [v-ing] at [art] | 73 |
|
