| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [verb] on for a | 12 |
|
| 2 | been [verb] on for a | 12 |
|
| 3 | [been] [v-ing] on for a | 10 |
|
| 4 | [been] going on for a | 8 |
|
| 5 | [been] go on for a | 8 |
|
