Once an opinion is given, you can agree or disagree with it. These are different ways of expressing that you either agree or diasgree with what another person says. Most are typical conversational ways of agreeing or not.
To agree with an affirmative statement:
To agree with a negative statement:
To disagree: you can simply use the opposite form of the corresponding auxiliary verb:
- "I am happy" - "I'm not"
- "I am not hungry" - "I am"
- "We went to the concert last night" - "I didn't"
- Mike can't reach the top shelf" - "I can"
Other basic expressions to agree or disagree: