Вопрос по английскому языку:

Вставьте 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 couldn’t ___ let him ___ go.