| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] have been a [adj] factor | 28 |
|
| 2 | [noun sg] have [been] a [adj] factor | 21 |
|
| 3 | [noun sg] has [been] a [adj] factor | 19 |
|
| 4 | [noun sg] had [been] a [adj] factor | 8 |
|
| 5 | [noun sg] have [been] an [adj] factor | 7 |
|
| 6 | [noun sg] have [been] a major factor | 5 |
|
