| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [conj] [det] [noun pl] | 409 |
|
| 2 | is doubtful [conj] [det] | 59 |
|
| 3 | doubtful [conj] [det] [noun pl] | 14 |
|
| 4 | is doubtful [conj] [noun pl] | 6 |
|
