| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be a [adj] and difficult [noun sg] | 23 |
|
| 2 | [be] a [adj] and difficult [noun sg] | 23 |
|
| 3 | [be] a [adj] and difficult [noun sg] | 19 |
|
| 4 | is a [adj] and difficult [noun sg] | 13 |
|
| 5 | [is] a [adj] and difficult [noun sg] | 13 |
|
| 6 | [be] a long and difficult [noun sg] | 6 |
|
| 7 | [be] a long and difficult [noun sg] | 6 |
|
| 8 | [was/were] a [adj] and difficult [noun sg] | 6 |
|
| 9 | was a [adj] and difficult [noun sg] | 6 |
|
