| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] have [been] [v-ing] since 1987 | 5 |
|
| 2 | [noun sg] have be [v-ing] since 1987 | 5 |
|
| 3 | [noun sg] have been [v-ing] since 1987 | 5 |
|
