| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | 's been travelling for [adj] hours | 5 |
|
| 2 | 's be travelling for [adj] hours | 5 |
|
| 3 | 's [been] travelling for [adj] hours | 5 |
|
| 4 | 's [be] travelling for [num] hours | 5 |
|
