How do I say this in French?

Your sentence does not make any sense.

it`s either

J'ai fait une autre chose.

or

Une autre chose QUE j'ai faite.

anyway.. it`s not a very beautiful French sentence.

The guy before me is wrong.. sometimes you have to agree with avoir too.

Une autre chose que j'ai faitE.

You have to conjugate the verbe coz 'chose' is feminin.

Every time there's a verb followed by "que" you have to conjugate IF the thing/person in question is a girl/female.

Example: La pomme que j'ai mangéE

The apple that I ate

Plus your gender won't affect the verb, even adjectives like beau (handsome)

Une autre chose j'ai faite

Simply "j'ai fait autre chose".

Another thing l did was..."une autre chose que j'ai faite (c')était...

Une autre chose que j'ai faite (the "e" on your past partciple "faite"" is because "chose" is feminine; thus you must show agreement) Had you said, "Le devoir que j'ai fait, était facile", (The homework (masc. word) that I did, was easy.)

I am = Je suis

If you want to say guy I think its proof. something along those lines. Here's a couple of tips to help you. That une is feminine. And that "fait" means to do or to make. So basically you want to say Je suis un proof.

lettuce = l. a. salade milk = le lait ice cream = l. a. glace bread = le affliction banana = l. a. banane orange = l'orange apple = le pomme carrot = le carrot cake = le gateau egg = l'oeuf cheese = le fromage ear = ? eye = ? red = violet purple = rose orange = orange yellow = jaune black = noir pen = le stylo pencil = le crayon table = le bureau frog = ? horse = le cheveau get dressed = ? blouse = ? pants = pantalon shawl = ? coach = gare lady = ? woman = ? youngster = ? guy = ? Boy = le garcon plate = plat cup = le verre soz if improper spelling

There`s something missing if you want to write this in French.

You can`t translate another thing I did word for word...

It`s more like another thing THAT I did in French.

and your gender doesn`t have anything to do with how you accord the verb here.

wou;dn't it be je suis un garcon?

NONE?