| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been many [noun pl] | 76 |
|
| 2 | have been many attempts | 7 |
|
| 3 | have been many changes | 7 |
|
| 4 | have been many change | 7 |
|
| 5 | have been many attempt | 7 |
|
| 6 | have been many studies | 6 |
|
| 7 | have been many study | 6 |
|
| 8 | have been many [noun sg] | 5 |
|
