| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] the reason for | 49 |
|
| 2 | [vb infin] the reason for | 49 |
|
| 3 | [vb infin] the reason for | 26 |
|
| 4 | [vb infin] the reasons for | 23 |
|
| 5 | understand the reason for | 7 |
|
| 6 | know the reason for | 5 |
|
