| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long [noun] | 3907 |
|
| 2 | [prep] a [adj] time | 3431 |
|
| 3 | [prep] a [adj] time | 3063 |
|
| 4 | [prep] a long time | 1752 |
|
| 5 | [prep] [art] long time | 1733 |
|
