Bây giờ mỗi khi cần tra cứu từ vựng tiếng Anh, mình thường dùng từ điển trực tuyến :
+ TheFreeDictionary (VD: http://tfd.com/learn )
+ Translate.google.com (VD: https://translate.google.com/?tl=vi&text=learn )
Trường hợp phức tạp hơn, như learned và learnt sự khác biệt, thì tham khảo từ Mrs. Google:
Từ điển Oxford: https://en.oxforddictionaries.com/usage/learnt-vs-learned
Writing Explained: https://writingexplained.org/learnt-vs-learned-difference
Writing Skills: https://www.writing-skills.com/60-second-fix-learnt-or-learned
Grammar DOT com: https://www.grammar.com/learned_vs._learnt
JakubMarian statistics (graphs): https://jakubmarian.com/learnt-vs-learned-in-english/
Blog grammarly: https://www.grammarly.com/blog/learned-learnt/
Baxter Netherlands: http://baxtercommunications.nl/burned-burnt-learned-learnt-spelled-spelt/#.XCy9HXUzY8o
(similar: burnt/burned , program/programme )
My Recap: both are used in many regions, especially in speaking. We can use the one we like/prefer, as long as consistent, no need to explicitly tell one is “wrong” or the other is “right”. The most “critical” debatable is probably some grammar test in which the most relevant information is that word.
Nevertheless in practical usage the “actual” information is usually something else than the “correct” suffix of the tense.
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@Enthusiasms: While you are at it , can you please explore the differences between “study”, “research” and “investigate” ?
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