| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been engaged in | 68 |
|
| 2 | have be engaged in | 68 |
|
| 3 | had be engaged in | 31 |
|
| 4 | have be engaged in | 20 |
|
| 5 | has be engaged in | 10 |
|
