| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] on [num] [noun] | 641 |
|
| 2 | [was/were] [verb] on [num] [noun prp] | 479 |
|
| 3 | [be] [verb] on [num] april | 71 |
|
| 4 | [was/were] [verb] [prep] [num] april | 50 |
|
| 5 | [was/were] [verb] on [adj] april | 48 |
|
| 6 | [was/were] [verb] on [num] april | 45 |
|
