Confusable Words: Fell, felt, felled

Japanese learners of English often confuse ‘fell’ and ‘felt’, probably because they sound so similar.
‘Fell’ is the past tense of ‘fall’
‘Felt’ is the past tense of ‘feel’.

“I injured my leg when I fell down the steps of my office entrance.”
“I felt so tired that I had to go straight to my hotel to sleep.”

There is another similar word, though this one is used rarely in conversation! To “fell” means to cut down, usually a tree. The past tense of this is “felled”.
“The tree was badly damaged in the hurricane, and so it was felled to prevent danger to passers by.”