首先要从汉意，英文拼写，读音，形式变化上分清楚，然后再从用法上分清楚。
feel v. 觉得，感觉，摸起来，认为
fall. v.倒塌，跌倒，掉落
n. (美式）秋天
原形，过去式，过去分词，现在分词，三单形式直观图：
feel的用法
① feel+adj.
② feel+adv.
③ feel sb/sth+ do/doing
④ feel it adj.+(for sb) to do
feel it adj.+that从句
⑤ feel like+n
feel like+doing=want to do=would like
to do 想做某事
feel like+that从句
⑥ feeling n. 感情，感觉 (pl) feelings
例句
① I’m feeling much better now.
现在我感觉好多了。
② He feels differently.他感觉不一样。
③ feel sb/sth do sth 感觉‥‥‥做了某事
feel sb/sth doing sth 感觉‥‥‥正在做某事
He felt her hear of it.他感觉她听说了事。
She can feel her heart beating fast.
她能感觉到心跳在加速。
④ I feel it very useful to learn English well.
我认为学好英语很有用。
I feel it impossible that he killed himself.
我认为他自杀是不可能的。
⑤ It feels like rain soon.
感觉很快要下雨了。
The cloth feels like silk.
这块布摸起来像丝绸。
I didn’t feel like eating anything this
morning.今早我什么都不想吃。
I feel like that I was a bird.
我感觉我像只鸟。
⑥ I get such a strong feeling of
satisfaction.
The film is full of sad feelings.
这部电影充满了悲伤的情感。
我得到了一种强烈的满足感。
fall的用法(瞬间动词，不能和时间段连用）
① fall asleep 入睡，睡着
fall fast asleep 睡熟，睡得香
② fall ill 生病，得病
③ fall in love (with) 相爱，爱上……
④fall down 摔倒，跌倒，坍塌
⑤ fall off sth=fall down from sth从……摔下
⑥ fall into 掉入，落入
⑦ fall over（指向前）绊倒，摔倒
fall over sth 被……绊倒，不是“绊倒某物”
⑧ vi. 降落
⑨ fallen adj.落下的，倒下的
例句
① Because I was very tired, I soon fell
fast asleep.因为我累极了，很快就进
入梦乡。
② He fell ill last week.上周他生病了。
③ They fall in love.他们相爱了。
Tom has fallen in love with the pretty
girl.汤姆爱上了那个漂亮姑娘。
④ Babies often fall down when they learn
to walk.婴儿在学走路时经常摔倒.
⑤ He fell off the tree.=He fell down from
the tree.他从树上摔下来了。
⑥ The boy fell into the river and was
pulled out at once.
那个男孩掉进河里，立刻被拉上来了。
⑦ There is too much snow on the road.
Be careful not to fall over.
路上雪太多。当心别摔倒。
He fell over a chair and hurt his right
foot.他被椅子绊倒了，伤着了右脚。
⑧ The snow is falling heavily tonight.
今晚这雪下得很大。
⑨ After a rainstorm fallen trees and
broken windows were everywhere.
一场暴风雨之后，倒下的树木、破碎的窗
户无处不在。
I like fallen leaves in fall.
我喜欢秋天的落叶。