| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] at a [noun] | 144 |
|
| 2 | is [verb] at a [noun sg] | 133 |
|
| 3 | be [verb] at a time | 107 |
|
| 4 | [be] [verb] at a time | 107 |
|
| 5 | is [verb] at [art] time | 33 |
|
| 6 | is [verb] at [art] time | 33 |
|
| 7 | is [verb] [prep] a time | 27 |
|
| 8 | is [verb] [prep] a time | 27 |
|
| 9 | is [verb] at a time | 17 |
|
| 10 | is [verb] at a time | 17 |
|
| 11 | is [verb] at a time | 17 |
|
| 12 | [is] [verb] at a time | 17 |
|
