| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for a long time | 1601 |
|
| 2 | [vb infin] a long time | 122 |
|
| 3 | [vb infin] for a long | 38 |
|
| 4 | [vb infin] for a time | 7 |
|
