13. fall/feel/fell/fail

fall    用法： 落下；跌倒 → fall-fell-fallen

                 E.g.: An apple fell to the ground. (一個蘋果落在地上。)

   feel    用法： 覺得；有感覺 → feel-felt-felt

feel like + V-ing (想要；摸起來像…)

                 E.g.: I felt my heart beat violently. (我感覺我的心在猛跳。)

                 E.g.: I feel like taking a walk. (我想要去散步。)

feel    用法： 砍伐(樹木) → fell-felled-felled

                 E.g.: He fell down while he was felling a tree.

                 (他砍樹時跌倒了。)

fail    用法： 失敗；(考試)不及格 → fail-failed-failed

                 E.g.: Helen failed in the examination. (海倫考試不及格。)