| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been undergoing a [adj] [noun] | 7 |
|
| 2 | [verb] been undergoing a [adj] [noun] | 7 |
|
| 3 | has been undergoing a [adj] [noun] | 5 |
|
| 4 | [vb -s] been undergoing a [adj] [noun] | 5 |
|
