| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which had [been] [v-ing] | 162 |
|
| 2 | which [vb past] been [v-ing] | 162 |
|
| 3 | which [vb past] [been] going | 11 |
|
| 4 | which [vb past] [been] running | 6 |
|
| 5 | which [vb past] [been] building | 6 |
|
