| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] which [verb] been built [prep] | 20 |
|
| 2 | [noun] which have been built [prep] | 20 |
|
| 3 | [noun] which [verb] been built [prep] | 20 |
|
| 4 | [noun] which had been built [prep] | 14 |
|
| 5 | [noun] which [vb past] been built [prep] | 14 |
|
| 6 | [noun sg] which [verb] been built [prep] | 14 |
|
