| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they did not understand | 39 |
|
| 2 | they did [adv] understand | 39 |
|
| 3 | they did [not/n't] understand | 39 |
|
| 4 | they did n't understand | 20 |
|
| 5 | they did not understand | 19 |
|
