| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been a major [noun] | 103 |
|
| 2 | has [been] a major [noun sg] | 102 |
|
| 3 | has [been] a major factor | 15 |
|
| 4 | has [been] a major factor | 15 |
|
| 5 | has [been] a major cause | 5 |
|
| 6 | has [been] a major cause | 5 |
|
