So, some prefixes can change a word into an antonym, meaning a word that’s the complete opposite. Here are some examples.
Illegal — Legal
Impossible – Possible
Incorrect – Correct
Informal – Formal
Invisible – Visible
Irregular – Regular
Unhappy – Happy
Unusual – Usual
Choose the correct alternative.
- Many common English verbs, such as go, do, and make, have a regular/an irregular past form.
- People aren’t usually happy/unhappy when somebody reads their private messages.
- ‘A books’ is correct/incorrect English.
- You couldn’t see the message. It was visible/invisible.
- ‘Dear Sir or Madam’ which is often used in hotels or email language, is a formal/informal expression.
- It is legal/illegal to steal data.
- It is possible/impossible to read hundreds of messages in just two minutes.