| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | than it [vb mod] to | 61 |
|
| 2 | than it [modal v] to | 61 |
|
| 3 | than it used to | 51 |
|
| 4 | than it used to | 51 |
|
| 5 | than it ought to | 8 |
|
| 6 | than it ought to | 8 |
|
