| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [be] concerned for some time | 5 |
|
| 2 | [verb] [been] concerned for some time | 5 |
|
| 3 | [verb] been concerned for some time | 5 |
|
| 4 | [verb] [be] concerned for some time | 5 |
|
| 5 | [verb] be concerned for some time | 5 |
|
