| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] been carried [adv prt] | 8 |
|
| 2 | could [verb] be carried [adv prt] | 8 |
|
| 3 | could have be carried [adv prt] | 8 |
|
| 4 | could have be carried [adv prt] | 8 |
|
| 5 | could [vb infin] be carried [adv prt] | 8 |
|
| 6 | could [verb] be carried out | 7 |
|
