| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [verb] on for | 130 |
|
| 2 | been [verb] on for | 130 |
|
| 3 | [been] [v-ing] on for | 118 |
|
| 4 | [been] go on for | 96 |
|
| 5 | [been] going on for | 95 |
|
| 6 | [been] [vb pp] on for | 12 |
|
| 7 | [been] working on for | 10 |
|
| 8 | [been] work on for | 10 |
|
