fall,feel,fell,fail 辨析
1. fall─fell─fallen 落下；跌倒
fall asleep睡着/fall behind落后
例句：
①An apple fell to the ground. (一个苹果落在地上。)
②Be careful on the ice or you will fall. (在冰上要小心，否则你会跌倒。)
2. feel─felt─felt
feel like＋doing sth. 想要；
feel sleepy. 想睡
例句：
①Can you feel your heart beat violently? (你能感觉到你的心在猛烈地跳动吗？)
②Both my legs didn’t feel. (我的双腿没有感觉。)
③I suddenly felt a pain in my back. (我突然感到背部疼痛。)
④Do you feel like taking a walk? (你想不想去散步？)
3. fell─felled─felled 砍伐
例句：
A lot of trees were felled last night. (昨晚很多树被人伐倒了。)
4. fail─failed─failed 失败
例句：
He has failed in English exam again. (他英语考试又没及格。)
