英文文法-動詞時態-On-line English線上免費英文資源
一般時態 進行式態 完成式態 完成進行式態 現 在 study studies is/ am/ are studying has/ have studied has/ have been studying 過 去 studied was/ were writing had studied had been studying 將 來 shall/ will study shall/ will be studying shall/ will have ......