| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] | 124168 |
|
| 2 | have been [to-vb] | 1120 |
|
| 3 | have been strengthen | 62 |
|
| 4 | have be to strengthen | 6 |
|
| 5 | have [be] to strengthen | 6 |
|
| 6 | [verb] been to strengthen | 6 |
|
| 7 | have [been] to strengthen | 6 |
|
