No | Pattern | Freq | Relations |
---|---|---|---|
1 | is [adv] difficult [to-vb] [art] | 148 | |
2 | is [adv] difficult [to-vb] [conj] | 95 | |
3 | [adv] difficult [to-vb] [conj] [art] | 66 | |
4 | is difficult [to-vb] [conj] [art] | 60 | |
5 | is [adv] difficult [conj] [art] | 18 | |
6 | is [adv] [to-vb] [conj] [art] | 12 |