| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] extensive [noun sg] [prep] | 7 |
|
| 2 | has be extensive [noun sg] [prep] | 7 |
|
| 3 | has been extensive [noun sg] [prep] | 7 |
|
| 4 | has [be] extensive [noun sg] of | 5 |
|
