Other vs. another
Nouns and articlesRule 8 of 10
The rule
"Another" is one word and goes with a singular noun: "another cup". Use "other" with plural or uncountable nouns: "other people", "other information". "The other" means the remaining one you both know about.
Wrong and right
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Wrong Can I have other cup of coffee?
Right Can I have another cup of coffee?
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Wrong Some tests passed; another tests failed.
Right Some tests passed; other tests failed.
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Wrong Let's talk about it an other time.
Right Let's talk about it another time.
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Wrong Do you have this shirt in other color?
Right Do you have this shirt in another color?
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Wrong I'll ask another colleagues for help.
Right I'll ask other colleagues for help.