Further and farther are easily confused as both words can be used to say “at a greater distance”. To be sure you are using them correctly take a look at the following explanation.
    
How to Use Further
- Further refers to figurative, abstract, or metaphorical distances.
 - It can be an adverb, an adjective, or even a verb.
 - When used as a verb, it means to promote a cause.
 
Further Examples:
- There is room for further improvement in English.
 - Please contact our agent in Spain for further information.
 - We will help you further.
 - Her departure pre-empted any further questions.
 - We expect to see further improvement over the coming year.
 - It provided the spur to further research.
 
How to Use Farther
- Farther refers to physical distance.
 - It’s used as an adjective or an adverb.
 
Farther Examples:
- Shall we go farther?
 - We can’t go any farther without resting.
 - Rome is farther from London than Paris is.
 - I can throw the ball farther than you can.
 - How much farther is it to the airport?
 - It was farther to the shops than I expected.
 
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