| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] on [prep] a | 40 |
|
| 2 | been going on [prep] [art] | 38 |
|
| 3 | [be] going on [prep] a | 33 |
|
| 4 | be going on [prep] a | 33 |
|
| 5 | been going [adv] [prep] a | 18 |
|
| 6 | been [v-ing] on [prep] a | 15 |
|
| 7 | been go on [prep] a | 10 |
|
| 8 | [been] going on [prep] a | 10 |
|
