| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have broken down | 185 |
|
| 2 | had broken down | 89 |
|
| 3 | has broken down | 39 |
|
| 4 | have broken down | 34 |
|
| 5 | have broken down | 8 |
|
| 6 | to have broken down | 5 |
|
