Aleksas __________ (change) the light bulb for half an hour.
Aleksas has been changing the light bulb for half an hour.
Michail __________ (drill) two holes before he realised he was using the wrong drill bit.
Michail had drilled two holes before he realised he was using the wrong drill bit.
Akvilė __________ (mend) a shoe heel when the glue ran out.
Akvilė was mending a shoe heel when the glue ran out.