| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [been] [v-ing] on | 75 |
|
| 2 | [vb base] been [v-ing] on | 75 |
|
| 3 | have [been] [v-ing] on | 38 |
|
| 4 | 've [been] [v-ing] on | 37 |
|
| 5 | [vb base] [been] going on | 27 |
|
| 6 | [vb base] [been] working on | 20 |
|
