| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been a [noun] | 1784 |
|
| 2 | had been a [noun sg] | 1722 |
|
| 3 | have been a factor | 31 |
|
| 4 | [verb] been a factor | 31 |
|
| 5 | had been a factor | 5 |
|
| 6 | had be a factor | 5 |
|
| 7 | [vb past] been a factor | 5 |
|
| 8 | had [be] a factor | 5 |
|
| 9 | had been [art] factor | 5 |
|
| 10 | had [been] a factor | 5 |
|
