| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have been chairman [prep] | 20 |
|
| 2 | [pron] have been chairman [prep] | 20 |
|
| 3 | [pron] have been chairman of | 17 |
|
| 4 | [pron] have been chairman of | 17 |
|
