| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [noun] | 1451 |
|
| 2 | [verb] [been] chairman | 31 |
|
| 3 | have [been] chairman | 31 |
|
| 4 | had [be] chairman | 9 |
|
| 5 | [vb past] [been] chairman | 9 |
|
