| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adj] [noun] [modal v] | 475 |
|
| 2 | at [adj] [noun sg] [modal v] | 328 |
|
| 3 | [prep] [adj] time [modal v] | 119 |
|
| 4 | at [adj] time [modal v] | 79 |
|
