| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been president [prep] | 26 |
|
| 2 | [vb past] been president of | 24 |
|
| 3 | [vb past] been president of | 24 |
|
| 4 | had been president [prep] | 24 |
|
