Mets au present perfect ou au prétérit les verbes du journal de
bord d'une astronaute en mission sur la planète Andor.
We (be) here for seven weeks now and (do) many experiments. Two days
ago, Scott (manage) to create soil and he (plant) vegetables. We (be) on
three exploration missions so far, but we (not, find) any living creatures
yet. Our last mission (be) three days ago. We (take) the rover and (travel)
north of the landing site. The landscape is quite mountainous. We (never,
see) such high mountains before. We (not, find) any source of water. So
far, we (not, encounter) any serious problems.