Grammar: Chapter 16 - Modal verbs of present, past ability and future ability. MODALS OF ABILIT Y: CAN and COULD, BE ABLE TO + V (bare
infinitive). Present Ability with CAN, BE ABLE TO :
CAN and BE ABLE TO is used to talk about an ability in the present. CAN is more
commonly used than BE ABLE TO. Nội dung trích xuất từ tài liệu: Grammar sense 1 - from chapter 16 to 18