| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [to-vb] a long time | 7 |
|
| 2 | be [v-ing] [to-vb] a long time | 7 |
|
| 3 | [is] [v-ing] [to-vb] a long time | 6 |
|
