| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could hear [noun pl] | 72 |
|
| 2 | hear [noun pl] [v-ing] | 32 |
|
| 3 | could hear [v-ing] | 13 |
|
| 4 | could [noun pl] [v-ing] | 5 |
|
