| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [art] significant [noun sg] | 53 |
|
| 2 | have [been] a significant [noun sg] | 45 |
|
| 3 | has [been] [art] significant [noun sg] | 38 |
|
| 4 | have [been] [art] significant increase | 10 |
|
| 5 | had [been] [art] significant [noun sg] | 6 |
|
| 6 | have [been] no significant [noun sg] | 6 |
|
| 7 | have [been] [art] significant decline | 5 |
|
