| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult because it [be] | 10 |
|
| 2 | difficult because it be | 10 |
|
| 3 | difficult because it [be] | 10 |
|
| 4 | difficult because it [is] | 9 |
|
| 5 | difficult because it is | 8 |
|
