| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [been] [v-ing] [prep] | 1995 |
|
| 2 | which [vb base] [been] [v-ing] | 45 |
|
| 3 | which [vb base] [v-ing] [prep] | 33 |
|
| 4 | which [vb base] [been] [prep] | 31 |
|
