| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] on [prep] some time | 12 |
|
| 2 | [been] [v-ing] on [prep] some time | 12 |
|
| 3 | [be] [v-ing] on [prep] some time | 12 |
|
| 4 | been [v-ing] on [prep] some time | 12 |
|
