| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [to-vb] [adv prt] | 895 |
|
| 2 | is used [to-vb] | 768 |
|
| 3 | used [to-vb] [adv prt] | 242 |
|
| 4 | is used [adv prt] | 31 |
|
