| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] | 124168 |
|
| 2 | have been [to-vb] | 1120 |
|
| 3 | have been ensure | 12 |
|
| 4 | [verb] been to ensure | 10 |
|
| 5 | have [be] to ensure | 10 |
|
| 6 | have [been] to ensure | 10 |
|
| 7 | have be to ensure | 10 |
|
