| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [adv] | 55870 |
|
| 2 | had [adv] | 38189 |
|
| 3 | [verb] once | 3797 |
|
| 4 | [vb past] once | 1847 |
|
| 5 | have once | 1304 |
|
| 6 | had once | 1105 |
|
