| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] how long | 248 |
|
| 2 | for [Wh adv] long | 122 |
|
| 3 | of [Wh adv] long | 39 |
|
| 4 | on [Wh adv] long | 27 |
|
| 5 | about [Wh adv] long | 18 |
|
| 6 | to [Wh adv] long | 16 |
|
| 7 | over [Wh adv] long | 5 |
|
| 8 | at [Wh adv] long | 5 |
|
