No | Pattern | Freq | Relations |
---|---|---|---|
1 | be difficult [verb] at [art] | 8 | |
2 | [be] difficult [verb] at [art] | 8 | |
3 | [adv] difficult [verb] at [art] | 6 | |
4 | [adv] difficult [verb] at [art] | 6 | |
5 | difficult [verb] at [art] [adj] | 9 | |
6 | difficult [verb] at [art] [noun] | 8 | |
7 | difficult [verb] at [art] [noun sg] | 6 |