| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] [been] [v-ing] | 1214 |
|
| 2 | [been] [v-ing] at | 511 |
|
| 3 | [vb infin] [v-ing] at | 182 |
|
| 4 | [vb infin] [been] at | 166 |
|
