You probably already know the first rule of adding an 'e' to make a feminine adjective (See previous lesson Most adjectives can be made feminine by adding -e in French). It doesn't work for every French adjectives.
Learn how to form feminine adjectives ending in a mute -e in French
Il y a un rat gris et une souris grise.There is a grey rat and a grey mouse.
Now look at these cases:
J'ai acheté un sac rouge et une robe rouge.I bought a red bag and a red dress.
Il connaît un garçon timide et une fille timide.He knows a shy boy and a shy girl.
Je me suis cassé le bras gauche et la main gauche.I broke my left arm and my left hand.
Notice that when the adjective already ends in a mute -e in the masculine form, it stays the same in the feminine form.
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