| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] at [pron] | 1231 |
|
| 2 | [be] [v-ing] at [pron] | 1231 |
|
| 3 | is [v-ing] [prep] [pron] | 1004 |
|
| 4 | is [verb] at [pron] | 152 |
|
| 5 | [is] [v-ing] at [pron] | 129 |
|
