帮我纠正英语作文错误，快速！谢谢了

When I was having lunch in my home, I suddenly heard of someone fighting outside. When I looked out through the window I found out that it was actually an argument between a young couple. The girl had become hysteric and shouted some foul words at the boy, who immediately knelt down in front of her. However, the girl did not seem to buy his bill. Just as I was going to pity for the boy, he gave an sudden outburst and slapped the girl. Now I know that the boy is going crazy because a gentleman never beats a defenseless women.

i was just having lunch at home, sudenlly i heart a sound like someone was frightting. when i looked through the window i saw there were a young couple. the girl had a fit of hysterics and called the boy by some bad names .at once the boy knelt to the girl ,but the girl refused to listen to him. when i stated to feel pity about him, he suddenly outburst of temper and gave the girl a slap. i thought the boy must be out of his mind. because a gentleman would