| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] difficult [verb] [conj] | 64 |
|
| 2 | it be [adv] difficult [to-vb] [conj] | 64 |
|
| 3 | it is [adv] difficult [verb] [conj] | 43 |
|
| 4 | it be [adv] difficult [verb] [subord] | 38 |
|
| 5 | it be [adv] difficult [verb] whether | 25 |
|
| 6 | it be [adv] difficult [verb] whether | 25 |
|
| 7 | it be [adv] difficult [verb] [that] | 17 |
|
| 8 | it be [adv] difficult [verb] that | 17 |
|
| 9 | it be [adv] difficult [verb] that | 17 |
|
| 10 | it be very difficult [verb] [conj] | 16 |
|
| 11 | it 's [adv] difficult [verb] [conj] | 11 |
|
| 12 | it was [adv] difficult [verb] [conj] | 10 |
|
| 13 | it be more difficult [verb] [conj] | 9 |
|
| 14 | it be [adv] difficult [verb] [coord] | 9 |
|
| 15 | it be [adv] difficult to know [conj] | 8 |
|
| 16 | it be [adv] difficult [verb] and | 8 |
|
| 17 | it be [adv] difficult know [conj] | 8 |
|
| 18 | it be [adv] difficult [verb] and | 8 |
|
| 19 | it be sometimes difficult [verb] [conj] | 6 |
|
| 20 | it be [adv] difficult say [conj] | 6 |
|
| 21 | it be often difficult [verb] [conj] | 6 |
|
| 22 | it be [adv] difficult to say [conj] | 6 |
|
| 23 | it be [adv] difficult to believe [conj] | 5 |
|
| 24 | it be [adv] difficult believe [conj] | 5 |
|
| 25 | it be extremely difficult [verb] [conj] | 5 |
|
