decide on + n/动名词结构 eg:he has decided on (going there)/(that trip). decide to do 不定式结构 (非谓语) eg:he has decided to go for a holiday. 另外 decide on 强调决定了什么事(可决定做可决定不做) eg:he has decided on the complex decision which troubled him for a long time. decide to do 强调决定了要做某事 eg:he decided to refuse her .