| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [prep] a [noun sg] | 1628 |
|
| 2 | used [prep] a [noun sg] | 1534 |
|
| 3 | is used [prep] a | 228 |
|
| 4 | is used [prep] [noun sg] | 209 |
|
