| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [art] [adj] factor | 94 |
|
| 2 | have [been] a [adj] factor | 63 |
|
| 3 | has [been] [art] [adj] factor | 44 |
|
| 4 | have [been] [art] major factor | 27 |
|
| 5 | have [been] [art] [adj] factor | 17 |
|
| 6 | have [been] an [adj] factor | 15 |
|
| 7 | have [been] the [adj] factor | 15 |
|
| 8 | had [been] [art] [adj] factor | 14 |
|
| 9 | to have [been] [art] [adj] factor | 13 |
|
| 10 | have [been] [art] key factor | 10 |
|
| 11 | have [been] [art] important factor | 10 |
|
| 12 | have [been] [art] contributory factor | 8 |
|
| 13 | have [been] [art] crucial factor | 5 |
|
