| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] than | 3550 |
|
| 2 | [is] [adj -er] than | 2286 |
|
| 3 | [be] tougher than | 25 |
|
| 4 | [is] tougher [conj] | 9 |
|
| 5 | [is] tough than | 8 |
|
| 6 | [is] tougher than | 8 |
|
| 7 | [is] tougher [subord] | 8 |
|
