| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [adv prt] [adv] | 252 |
|
| 2 | [vb infin] [adv prt] [v-ing] [adv] | 84 |
|
| 3 | could [vb infin] [adv prt] [v-ing] | 81 |
|
| 4 | could [vb infin] [v-ing] [adv] | 31 |
|
