1  Write sentences in the past perfect continuous and the past simple using the words below.
0   The explorers / sail / for days / when they / finally see / land
The explorers had been sailing for days when they finally saw land.

1   How long / you / work there / when you / become / a director ?
2 I/ not sleep / well / for weeks / when I / have / the accident at work
3 Paul / work / really long hours / for six months / when he / become ill
4  How long / Sarah / take / the medicine / before she / get better ?
5  We / not work / hard enough / so we / not can / go on holiday with the others​