taught和teach,怎么区分？什么时候用taught什么时候用teach

taught是teach的过去式和过去分词的形式，在一般现在时或者动词不定式中用teach；在现在完成时或者过去完成时中用taught；比如：I have taught English for six years；I want to teach English in the future/ I always teach English at school.