| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [was/were] [verb] on a | 41 |
|
| 2 | which [was/were] [vb pp] on a | 35 |
|
| 3 | which [was/were] base on a | 9 |
|
| 4 | which [was/were] based on a | 9 |
|
| 5 | which [was/were] [v-ing] on a | 6 |
|
