| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have been [verb] | 3466 |
|
| 2 | they have been [v-ing] | 907 |
|
| 3 | [pron] have been reading | 116 |
|
| 4 | they have been read | 10 |
|
| 5 | they have be reading | 6 |
|
| 6 | they [verb] been reading | 6 |
|
| 7 | they have [been] reading | 6 |
|
| 8 | they have [be] reading | 6 |
|
