| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [adj] [conj] a | 326 |
|
| 2 | is [adv] [adj] [conj] [v-ing] | 261 |
|
| 3 | [adv] [adj] [conj] [v-ing] a | 129 |
|
| 4 | is [adj] [conj] [v-ing] a | 9 |
|
