| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had to be [adv] [adj] | 98 |
|
| 2 | had to be kept [adv] | 14 |
|
| 3 | had to be kept [adj] | 11 |
|
| 4 | to be kept [adv] [adj] | 11 |
|
