Answer:
á (lower case a, acute accent) = Press Ctrl + ' (apostrophe), then the letter a. é (lower case e, acute accent) = Press Ctrl + ' (apostrophe), then the letter e. ...
Á (upper case A, acute accent) = Press Ctrl + ' (apostrophe), then Shift + a. ...
¿ (inverted question mark) = Press Alt + Ctrl + Shift + ? (