fragiliser conjugation

Je fragilise la vieille chaise en se balançant dessus.

I weaken the old chair by swinging on it.

J’ai fragilisé la table en posant un carton très lourd dessus.

I weakened the table by placing a very heavy cardboard on it.

Je fragilisais les étagères en les chargeant de gros livres.

I weakened the shelves by loading them with large books.

Je fragiliserai le pont en faisant passer trop de camions dessus.

I will weaken the bridge by passing too many trucks over it.