The words for, four, and fore all sound identical when spoken. They also have completely different meanings.
Here is a brief definition of each of the words:
For: A preposition with several uses.
Example 1: Use "for" instead of "because" or "because of": I could not sleep for it was too cold.
Example 2: Use "for" to show a reason or purpose: I received the money for an electric blanket.
Example 3: Use "for" to indicate a possible state of being or being part of: I would not be taken for an amateur.
Example 4: Use "for" to show responsibility or availability: The army is ready for war or peace.
There are other uses for the preposition for; the above list demonstrations several common uses.
Four: A number. The number 4. 2+2, 1+3, 4+0, 171-167... 4!
The word "four" has one use, and one use only - to state a number. Generally speaking, if the number you are writing in a paper is less than 100, you spell it out (eight, twenty, ninety-nine, four, etc.) and if it's over 100, you can use numbers. Four is 4, spelled out.
Fore: This is used in golf. When it appears a hit ball may get near to other people, golfers yell "Fore!" as a warning. This is similar in baseball, when a ball is hit near people and the players shout "Heads!" or "Heads Up!"
Fore actually means "forward" or "ahead" and may have its roots in military actions when weapons were fired from behind troops and "beware before!" was the warning that it was happening.
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