英语必修4译林牛津版unit 2
教案（grammar） unit 2 grammar and usage teaching aims: 1、 show ss that modal verbs can be used to talk about ability, obligation, certainty or permission, to make requests, suggestions, offers and to give advice. 2、 enable students to understand that some modal verbs can be used with the continuous form and the perfect form to talk about current affairs or past actions.
