| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been investigating [art] | 18 |
|
| 2 | [verb] been investigating the | 13 |
|
| 3 | [vb base] been investigating [art] | 8 |
|
| 4 | have been investigating [art] | 7 |
|
| 5 | [verb] been investigating a | 5 |
|
| 6 | [vb past] been investigating [art] | 5 |
|
| 7 | had been investigating [art] | 5 |
|
