| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be very difficult [prep] | 91 |
|
| 2 | it be very difficult [prep] | 91 |
|
| 3 | it be very difficult [prep] | 91 |
|
| 4 | it be very difficult for | 61 |
|
| 5 | it be very difficult for | 61 |
|
| 6 | it 's very difficult [prep] | 44 |
|
| 7 | it is very difficult [prep] | 31 |
|
| 8 | it was very difficult [prep] | 16 |
|
| 9 | it be very difficult to | 13 |
|
| 10 | it be very difficult to | 13 |
|
| 11 | it be very difficult at | 7 |
|
| 12 | it be very difficult at | 7 |
|
| 13 | it be very difficult in | 5 |
|
| 14 | it be very difficult in | 5 |
|
