| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | understand how [indef pn] [vb mod] | 9 |
|
| 2 | understand how [indef pn] could | 6 |
|
| 3 | understand how [indef pn] could | 6 |
|
| 4 | understand how anyone [modal v] | 6 |
|
