英語共有十六種時態(tài)，其表現(xiàn)形式如下（以study為例）

　    一般時        進行時          完成時          完成進行時
現(xiàn)在  study       be studying     have studied       have been studying
過去 studied      be studying     had studied        had been studying
將來 will study wil be studying will have studied will have been studying
過去將來would study would be studying would have studied would have been studying

時態(tài)（Tense）是表示行為、動作和狀態(tài)在各種時間條件下的動詞形式。因此，當(dāng)我們說時態(tài)結(jié)構(gòu)的時候，指的是相應(yīng)時態(tài)下的動詞形式。