去年の誕生日に彼女と出会ったって英語でなんて言うの？

When talking about how you met someone (female), you may explain that you met her on your birthday last year by using the above example sentence.

Either one of these two sentences can be used :- 1. I met her on my last birthday. 2. I met her last year on my birthday. Both of these sentences are different ways to express the same thing. That is that the day he met this person was last year on the date of his birthday.

This is another way to clearly explain that the person whom you met was a female. I hope that this helps :)

I met her on my birthday last year. This statement is not confusing, because you are stating the exact date that you met the person. You are also confirming that your birthday was last year. I met her on my previous birthday. Previous means former, so you are saying that you met her on your former birthday, before this year's one. Thus, you are saying that you met her last year, on your birthday. We met a year ago on my birthday. This sentence has the exact same meaning as the previous two. Again you are just saying that you met her about a year ago and that it was on your birthday.

I met her on my birthday, one year ago. - This sentence is past tense. It expresses that you met a female on your birthday one year ago. I met her on the day of my birthday last year. - This is another sentence which expresses that you met a female on your birthday one year ago.

"We met on my birthday last year" - This is a simple way of expressing you met last year on you birthday. "We've known each other a year on my birthday" - This is similar to above but this is expressing that you and the female would have known each other a year on your birthday.

When talking about when you met someone you are figuring out how long you have known them. To explain that you met her on your birthday last year, use the sentences above.