| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] hear [v-ing] [prep] [art] | 7 |
|
| 2 | could [be] heard [v-ing] [prep] [art] | 7 |
|
| 3 | could be hear [v-ing] [prep] [art] | 7 |
|
| 4 | could [be] hear [v-ing] [prep] the | 5 |
|
