First of all, your post is an isolated sentence (a question) and it is likely not the total message that you would send to a friend. If it were the total message (such as a telegram), it would sound threatening…much like a warning of danger due to weather or conflict. ’ The words ‘what would’ and ‘if you came’ are consistent with the future (not the past).
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Abdulla AbdulAziz Al-h Do you know what would happen if you came to my country?Does the sentence above mean that I want to show my friend what would happen if he could come to my country in the future or the past?It gives the impression that something serious would happen if they went to your country, so, they should avoid it.