| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been a [adj] factor | 63 |
|
| 2 | [verb] been a [adj] factor | 63 |
|
| 3 | has been a [adj] factor | 30 |
|
| 4 | [vb -s] been a [adj] factor | 30 |
|
| 5 | [verb] been a major factor | 23 |
|
| 6 | [verb] been a major factor | 23 |
|
| 7 | have been a [adj] factor | 12 |
|
| 8 | [vb infin] been a [adj] factor | 12 |
|
| 9 | [verb] been a key factor | 8 |
|
| 10 | [verb] been a contributory factor | 8 |
|
| 11 | [to-vb] been a [adj] factor | 8 |
|
| 12 | to have been a [adj] factor | 8 |
|
| 13 | had been a [adj] factor | 8 |
|
| 14 | [verb] been a contributory factor | 8 |
|
| 15 | [verb] been a key factor | 8 |
|
| 16 | [vb past] been a [adj] factor | 8 |
|
