| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [v-ing] for a | 205 |
|
| 2 | [vb infin] [been] [v-ing] for | 66 |
|
| 3 | [vb infin] [been] [v-ing] a | 55 |
|
| 4 | [vb infin] [v-ing] for a | 31 |
|
