| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] for a [adj] period | 21 |
|
| 2 | [vb infin] for a [adj] period | 21 |
|
| 3 | [vb infin] for a [adj] period | 19 |
|
| 4 | last for a [adj] period | 6 |
|
| 5 | continue for a [adj] period | 5 |
|
