| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had suffered from | 69 |
|
| 2 | has suffered from | 61 |
|
| 3 | have suffered from | 53 |
|
| 4 | having suffered from | 9 |
|
| 5 | have suffered from | 7 |
|
| 6 | to have suffered from | 7 |
|
