| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have heard | 156 |
|
| 2 | they [vb past] heard | 100 |
|
| 3 | they had heard | 81 |
|
| 4 | they [vb base] heard | 56 |
|
| 5 | they have heard | 34 |
|
| 6 | they 've heard | 22 |
|
| 7 | they 'd heard | 19 |
|
