`1.` I have painted the picture since last week.
- S + started/began/finished + to V/V-ing+.. + time
`->` S + have/has + VpII/have been + V-ing+ ... + for +time/ since + time
`2.` People started studying about space long ago.
- S + started/began/finished + to V/V-ing+.. + time
`->` S + have/has + VpII/have been + V-ing+ ... + for +time/ since + time
`3.` My little boy has watched TV for 20 minutes.
- S + started/began/finished + to V/V-ing+.. + time
`->` S + have/has + VpII/have been + V-ing+ ... + for +time/ since + time
`4.` How long has he studied English? (
- When + did + S + V-inf + ...?
`->` How long + have/has +S+ VpII+...?
`5.` Lan stopped playing games in July.
- stopped + V-ing