•physically/mentally active经常运动／思想活跃

•You've got to try to keep active as you grow older.年纪大了，应该尽量保持身心活跃。

•Enemy forces remain active in the mountainous areas around the city.敌军在城市周围的山区仍活动猖獗。

•She's very active in (= involved in) local politics.她积极参与当地的政治活动。

•Both of his parents were very politically active.他的父母在政治上都很积极。

•It is important to educate children before they become sexually active.在孩子进入性活跃期之前对他们进行有关教育很重要。

•He takes a more active role in the team nowadays.现在他在队里发挥着更为积极的作用。

•She's an active member of her trade union (= not only belongs to it, but does work to help it).她是工会中的活跃分子。

•'Catrin told me' is an active sentence, and 'I was told by Catrin' is passive.Catrin told me 是主动句，而 I was told by Catrin 是被动句。