verb
1
BAD : Those who disagreed to join the army were put in prison.
GOOD : Those who refused to join the army were put in prison.
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disagree = not have the same opinion: 'He disagreed with nearly everything I said.' 'Why did she disagree with you?' 'We tended to disagree about politics, but we were still good friends.'
refuse ( to do sth ) = say that you will not do something that someone has asked you to do: 'The students were asked to leave the building but they refused.' 'If anyone refuses to pay their bill, send for the manager.'
2
DUBIOUS : As a conservationist, I strongly disagree with the removal of these trees.
GOOD : As a conservationist, I strongly object to the removal of these trees.
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object ( to sth ) = say that you are against something' 'No member of the Council has ever objected to this principle.' 'He objects to being treated like a child.'
3
BAD : She disagreed totally to what I said.
GOOD : She disagreed totally with what I said.
BAD : Some people disagree to the death penalty.
GOOD : Some people disagree with the death penalty.
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disagree with sb/sth : 'I disagreed with their interpretation of the statistics.'
4
DUBIOUS : I disagree that heart transplants should be stopped.
GOOD : I don't agree that heart transplants should be stopped.
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When the subject is a particular person, use not agree to introduce a that clause: 'I don't agree that the people there are repressed.' 'She cannot agree that farmers should be an exception.'
In more general statements, disagree is usually used with not, nobody etc before a that clause, to give an affirmative meaning; 'No one can disagree that these crimes must be stopped.' (=everyone must agree that ...) 'Few would disagree that she has served her country well.' (=most would agree that ...)
5
BAD : I am disagree with the statement.
GOOD : I disagree with the statement.
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Disagree is used only as a verb (NOT as an adjective): 'She always disagrees with me.'