Воткните to перед инфинитивом, где это нужно. 1. My brother can

Воткните to перед инфинитивом, где это необходимо. 1. My brother can ___ speak French. 2. John let the hammer ___ drop out of his hands. 3. You must ___ take me back to Oxford. 4. They ought ___ have asked my advice. 5. You look tired. You should ___ go home. 6. I couldnt ___ let him ___ go.