| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb past] be [v-ing] for | 12 |
|
| 2 | which [vb past] been [v-ing] for | 12 |
|
| 3 | which [vb past] [been] [v-ing] for | 12 |
|
| 4 | which had [be] [v-ing] for | 12 |
|
