| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] been [noun sg] | 93 |
|
| 2 | who had been [noun sg] | 93 |
|
| 3 | who [vb past] been president | 10 |
|
| 4 | who [vb past] been secretary | 5 |
|
