| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] [was/were] | 23 |
|
| 2 | [vb mod] [to-vb] was | 20 |
|
| 3 | [vb mod] to do [was/were] | 12 |
|
| 4 | [vb mod] [to-vb] were | 6 |
|
