| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] been [v-ing] on [prep] | 19 |
|
| 2 | which have been [v-ing] on [prep] | 19 |
|
| 3 | which [verb] been going on [prep] | 17 |
|
| 4 | which [verb] been [v-ing] on for | 12 |
|
| 5 | which had been [v-ing] on [prep] | 9 |
|
| 6 | which [vb past] been [v-ing] on [prep] | 9 |
|
| 7 | which [vb -s] been [v-ing] on [prep] | 7 |
|
| 8 | which has been [v-ing] on [prep] | 7 |
|
