Put the verbs into the Past Perfect Continuous. Use full forms of the verbs, with one space between the words, type in the lowercase letters.
1) The explorers ... (sail) for days when they finally saw land.
2) We ... (revise) for our exam for two weeks to pass it.
3) How long ... you... (work) there when you became a director?
4) I ...(not/sleep) well for weeks when I had the accident at work.
5) Paul .. really (work) long hours for six months when he became ill.
6) How long ... Linda... (take) the medicine before she got better?
7) We... (not/save) hard enough so we couldn’t go on holiday with the others.