| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] n't know how long i | 19 |
|
| 2 | do n't know how long i | 19 |
|
| 3 | [vb base] n't know how long i | 17 |
|
| 4 | do n't know how long i | 17 |
|
| 5 | n't know how long i [verb] | 13 |
|
| 6 | n't know how long i [vb past] | 9 |
|
| 7 | n't know how long i [modal v] | 6 |
|
| 8 | n't know how long i [vb mod] | 6 |
|
