Cats can climb trees. Cats could climb trees. A racing car can move fastly. A racing car could move fastly. Birds can fly. Birds could fly. Dogs can dig holes. Dogs could dig holes. People can play the guitar. People could play the guitar. A secretary can type. A secretary could type. Whales can swim far away. Whales could swim far away. Teachers can teach. Teacher could teach. Students can study. Students could study. Monkeys can skip. Monkeys could skip.
Cats can´t climb trees. Cats could not climb trees. A racing car can´t move fastly. A racing car could not move fastly. Birds can´t fly. Birds could not fly. Dogs can´t dig holes. Dogs could not dig holes. People can´t play the guitar. People could not play the guitar. A secretary can´t type. A secretary could not type. Whales can´t swim far away. Whales could not swim far away. Teachers can´t teach. Teachers could not teach. Students can´t study. Students could not study. Monkeys can´t skip. Monkeys could not skip.
Can cats climb trees? Could cats climb trees? Can a racing car move fastly? Could a racing car move fastly? Can birds fly? Colud birds fly? Can dogs dig holes? Could dogs dig holes? Can people play the guitar? Could people play the guitarw Can a secretary type? Could a secretary type? Can whales swim far away? Could whales swim far away? Can teachers teach? Could teaches teach? Can students study? Could students study? Can monkeys skip? Could monkeys skip?