A person might be angry about another person’s repeated inappropriate behavior.  Or, a person could be upset because something does not work correctly.  That person could angrily say the words in red and at the same time tap beneath their chin with their fingertips.  The contraction ‘I’ve’ combines the words ‘I’ and ‘have’.

我已經受夠了，就到此為止吧！

對於他人一而再、再而三的無禮（或無理）行為，你我難免會生氣；對於本身怎麼做都做不來的事，內心或許更難過、更洩氣。屆時，不妨以這句話自我表白。