对于一般陈述句,可以通过在句子前面加上助动词 "do" 或 "did" 并将动词变为原形来改变否定句为肯定句。
例句 1: She does not like coffee.
改为肯定句:She does like coffee.
对于be动词,可以直接将其否定形式改为肯定形式。
例句 3: He is not happy.
改为肯定句:He is happy.
需要注意的是,如果否定句涉及到谓语动词是情态动词的情况,要将否定词移至情态动词之前,而不是在情态动词后面加上do或did。
例句 5: She cannot swim.
改为肯定句:She can swim.