| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have [been] [vb pp] for [det] | 13 |
|
| 2 | which have been [vb pp] for [det] | 13 |
|
| 3 | which had [been] [vb pp] for [det] | 9 |
|
| 4 | which have [been] [vb pp] for many | 7 |
|
