| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] which [verb] been referred to | 5 |
|
| 2 | [noun sg] which has be referred to | 5 |
|
| 3 | [noun sg] which [vb -s] be referred to | 5 |
|
| 4 | [noun sg] which have be referred to | 5 |
|
