| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has been [adj] [noun sg] | 30 |
|
| 2 | it has been [adj] [noun] | 23 |
|
| 3 | it has been [adj] [noun pl] | 13 |
|
| 4 | it has been [adj] year | 9 |
|
| 5 | it has been [num] [noun] | 9 |
|
| 6 | it has been [det] [noun] | 8 |
|
| 7 | it has been [adj] years | 8 |
|
| 8 | it has been common [noun] | 5 |
|
| 9 | it has been [adj] practice | 5 |
|
| 10 | it has been [adj] practice | 5 |
|
| 11 | it has been common [noun] | 5 |
|
