| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it used to [be] think | 15 |
|
| 2 | it [vb mod] to be think | 15 |
|
| 3 | it [vb mod] to [be] thought | 15 |
|
| 4 | it [vb mod] to [be] think | 15 |
|
