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What is the numbers eleven- thirty-one in french

Future simple vous pouvez commencer le travail can we write i like this vous puez commencer le travail

Any french speakers? i need some . how would i say 'my oldest brother is very tall, interesting, and good at drawinng.' in french? would it be: mon (i don't know the french word for oldest) frère est très grand, intéressant, et bon à dessin. also, how would i say 'my dad is good at his work' in french?