| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] [prep] a [noun sg] | 372 |
|
| 2 | [vb past] [been] [prep] a [noun sg] | 172 |
|
| 3 | who [vb past] [been] [prep] [noun sg] | 85 |
|
| 4 | who [vb past] [been] a [noun sg] | 81 |
|
| 5 | who [vb past] [been] [prep] a | 24 |
|
