| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | we have had [art] [noun] | 341 |
|
| 2 | [pron] have had [art] letter | 23 |
|
| 3 | we have [vb pp] [art] letter | 20 |
|
| 4 | we have [verb] [art] letter | 20 |
|
| 5 | we have have [art] letter | 6 |
|
| 6 | we [verb] had [art] letter | 6 |
|
