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We have an entire course teaching Spanish (Latin America) grammar and vocabulary.
Questions & Answers about Por suerte llegamos temprano.
Wait, does llegamos mean "we arrived" or "we arrive"?
Why do we use por instead of para in por suerte?
Por suerte is a fixed expression that translates to "luckily" or "fortunately" (literally "by luck"). Por is often used to build these kinds of descriptive phrases expressing the reason or manner of something. This is exactly the same way it builds the por si (just in case) phrases you are focusing on in this lesson!
Since it describes how we arrived, could I say tempranamente instead of temprano?