| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been chairman | 31 |
|
| 2 | have [been] chairman | 31 |
|
| 3 | [vb -s] [been] chairman | 18 |
|
| 4 | has [been] chairman | 18 |
|
| 5 | had [been] chairman | 9 |
|
| 6 | [vb past] [been] chairman | 9 |
|
