| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [to-vb] | 11583 |
|
| 2 | [vb pp] [to-vb] [adv prt] | 5937 |
|
| 3 | is [vb pp] [adv prt] | 4778 |
|
| 4 | is [to-vb] [adv prt] | 895 |
|
