| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has be [v-ing] on for | 41 |
|
| 2 | has been [v-ing] on for | 41 |
|
| 3 | has [been] [v-ing] on for | 41 |
|
| 4 | has [be] going on for | 37 |
|
