| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] be driving | 49 |
|
| 2 | [vb past] been driving | 48 |
|
| 3 | [vb past] [been] driving | 48 |
|
| 4 | had [be] driving | 37 |
|
| 5 | 'd [be] driving | 11 |
|
