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I bought an English grammar book 3 weeks ago. Is it correct to use any of the following sentences interchangeably to tell my friend that I bought the book, or is there a difference in meaning between each sentence?
1.I've just bought a book on English grammar, and it looks pretty good.
This sentence used a present perfect with "just" which indicates buying a book occurred very recently. It can even mean you bought a book a few minutes ago.
2.I just bought a book on English grammar, and it looks pretty good.
This sentence is very close to No.1 in that you used "just" for the past tense.
The purpose of Both No. 1 and No. 2 is (1) to indicate the timing of buyig the book and (2) the fact that he/she has it now.
3.I bought a book on English grammar, and it looks pretty good.
Reading this sentence, you cannot tell whether the book was bought recently or not. It happened in the past. No. 3 is different from No. 1 and No.2 in that sense.
The first line is the correct way to say it if you have recently purchased the book.
The second line is not grammatically correct.
The third line "I bought a book...." also works but doesn't imply a recent purchase.
