No | Pattern | Freq | Relations |
---|---|---|---|
1 | [be] difficult for us [verb] | 24 | |
2 | be difficult for us [verb] | 24 | |
3 | [be] difficult for us [to-vb] | 24 | |
4 | [is] difficult for us [verb] | 17 | |
5 | is difficult for us [verb] | 13 | |
6 | [be] difficult for us [verb] | 6 | |
7 | be difficult for us [verb] | 6 |