They've become good friends since last year.

[Sitifan]

1. They've become good friends since last year.
2. They've moved to Japan since last year.
Are the above two sentences acceptable?
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Thank you very much for your reply.

[Skrej]

Hi Sitifan,

Why don't you give us your choice first, then we'll correct you if necessary?
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Native speaker but not a perfect speaker.
But completely fluent in over six million forms of Teflese.

[Sitifan]

Someone says:
sentence 1 is correct.
sentence 2 should be:
They moved to Japan last year/ a year ago.
We use the past simple because the action of moving is complete.
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Do you agree?
_________________
Thank you very much for your reply.

[Yankee]

Hi Sitifan

Both of your sentences are fine. They both focus more on the fact that something has happened and less on when it happened.