| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had go [prep] school | 17 |
|
| 2 | had go to school | 15 |
|
| 3 | had go to school | 15 |
|
| 4 | had gone [prep] school | 10 |
|
| 5 | had to go [prep] school | 7 |
|
