| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [art] number of [noun pl] | 80 |
|
| 2 | have been [art] number [prep] [noun pl] | 80 |
|
| 3 | have been [art] number [prep] [noun pl] | 80 |
|
| 4 | have been a number [prep] [noun pl] | 79 |
|
| 5 | have been a number [prep] [noun pl] | 79 |
|
| 6 | have been [art] number [prep] [noun pl] | 62 |
|
| 7 | have been [art] number [prep] studies | 8 |
|
| 8 | had been [art] number [prep] [noun pl] | 8 |
|
| 9 | have been [art] number [prep] attempts | 7 |
|
| 10 | have been [art] number [prep] occasions | 5 |
|
| 11 | have been [art] number [prep] changes | 5 |
|
