Дополнительные предложения правильной формой Present perfect .
1. I know who your boss is. I (work) for him. 2. Look! Somebody already (broke) the tree. 3. Mary (go) to Moskow, but she’ll be back next Monday at the latest. 4. Andy is in hospital now. He (have) a bad crash. 5. Jane is crying. She (hurt) her knee.

1. I have worked for him.2. Somebody has already broken the tree.3. Mary has gone to Moskow...4. He has had a bad crash.5. She has hurt her knee.