A Funny Joke

All We all know about the fairy tale legend of "The Frog Prince". In the old version, the witch cursed (enchanted) that the prince would live remain as a frog till death unless a princess gave gives him a kiss. But now the witch's incantation In this version, is that the enchanted prince only can say one word every a year untill a princess agrees to his propose. The prince waits and waits. After 7 years, the prince can say a complete sentence eventually. He finds the princess and says to the princess For each year, he spoke a word to her.  So for seven years...  fondly:“ 

"My dear princess, will you marry me?"

When he completed his sentence, the princess looks at him and replied, says "Pardon?"

Please help me correct my grammar errors and word usage. or my lexical (word) errors.

The way you wrote the joke is unclear.  Took me a while to get the punch.

P.S. When I meet the encounter new words, I will refer to the dictionary. So sometimes I don't know whether the word in the brackets is right. Also I don‘t know whether if the "joke" in the heading is appropriate. 

When you use "whether", it must follow by "or...".  "Whether you eat or not, is not my concern".  The use of "if" does not have this requirement.  The title is fine.