| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] [prep] [art] | 3060 |
|
| 2 | be [v-ing] at [art] | 2298 |
|
| 3 | [be] [v-ing] at [art] | 2298 |
|
| 4 | is [verb] at [art] | 1224 |
|
| 5 | [is] [v-ing] at [art] | 332 |
|
