No | Pattern | Freq | Relations |
---|---|---|---|
1 | be [adv] difficult [to-vb] [art] | 259 | |
2 | be [adv] difficult [to-vb] [conj] | 226 | |
3 | be difficult [to-vb] [conj] [art] | 107 | |
4 | [adv] difficult [to-vb] [conj] [art] | 66 | |
5 | be [adv] difficult [conj] [art] | 37 | |
6 | be [adv] [to-vb] [conj] [art] | 32 |