| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [v-ing] [pron] | 10128 |
|
| 2 | [was/were] [v-ing] a | 4665 |
|
| 3 | [v-ing] [pron] a | 2005 |
|
| 4 | [was/were] [pron] a | 660 |
|
