No | Pattern | Freq | Relations |
---|---|---|---|
1 | a long period [modal v] [vb infin] | 6 | |
2 | a long period [modal v] [verb] | 6 | |
3 | [prep] a long period [modal v] | 6 | |
4 | [prep] a long period [modal v] | 6 | |
5 | over a long period [modal v] | 5 | |
6 | over a long period [modal v] | 5 |