| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [vb pp] at [v-ing] | 124 |
|
| 2 | and [is] [vb pp] at | 120 |
|
| 3 | and [vb pp] at [v-ing] | 18 |
|
| 4 | and [is] [vb pp] [v-ing] | 14 |
|
