Fais de beaux rêves
or
Faîtes de beaux rêves. "De doux rêves" also.
2008
If you are using sweet as in sugary sweet, the F Pl would be sucrées.
Voici un cadeau pour toi, ma chérie.
スイート (suiito) would be how you write it in katakana, though 甘い (amai) is the proper adjective for something that tastes sweet.
Jeannette would be the French equivalent of Janet.
chat
Madame
Lyon
To write "I am 34 years old" in French, you would write "J'ai 34 ans."
Well you cannot write a language in a different language because each language has a specific set of characters that they use just with themselves. If you wanted to write in French you would have to write in French. Like if you are American and wanted to write in Spanish you would use Spanish characters. Hope I answered your question :D
The same way you would write a letter in English, you just need to translate it into French. A French dictionary or an online translator might be helpful.
J'ai un crayon.