| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] on | 7806 |
|
| 2 | be [v-ing] on | 4284 |
|
| 3 | be concentrating [adv] | 44 |
|
| 4 | be concentrate on | 23 |
|
| 5 | be concentrating on | 15 |
|
| 6 | be concentrating [adv prt] | 15 |
|
| 7 | [be] concentrating on | 15 |
|
