| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been building up [prep] | 27 |
|
| 2 | have been building up [prep] | 27 |
|
| 3 | [vb past] been building up [prep] | 14 |
|
| 4 | had been building up [prep] | 14 |
|
| 5 | [vb -s] been building up [prep] | 10 |
|
| 6 | 's been building up [prep] | 6 |
|
| 7 | been building up [prep] [art] | 14 |
|
| 8 | been building up [prep] [art] | 14 |
|
| 9 | been building up [prep] the | 10 |
|
| 10 | been building up [prep] the | 10 |
|
| 11 | been building up [prep] [adj] | 5 |
|
