answered 一般过去时的谓语动词要用动词的过去式。
动词过去式的构成分规则变化和不规则变化两种形式，不规则变化通常需要逐个记忆，规则变化则遵循以下原则：(1) 一般在动词后加-ed。
如：play—played, watch—watched,answer—。
1、answer的过去式是answered。
2、answer：答复; 回答; (试题、练习等的) 答案，正确答案; (问题的) 解决办法，答案;适合; 符合; 比得上; 相配。
3、[例句]：I knew Ben was lying when he answered me.我知道本回。
answer是一个规则的动词，所以它的过去式直接加ed。
也就是 answered。
answer 英[ˈɑ:nsə(r)] 美[ˈænsə(r)]vt. 答复; 解答; 答辩; 适应;n. 回答; 答案; 反应; 足以媲美的人;[例句]I knew Ben was lying when he answered me 我知。
answer 的过去式为 answered 例: I answered his question in a full sentence.answer 的过去分词为 answered 例: I have answered your question already.