对,两句都有语法错误.修改如下：i admire him for his bravery.因为admire是动词做谓语后得接宾语所以用宾格him不用主格he(主格做主语用的）
第二个：i admire his bravery (因为admire是及物动词,顾名思义能直接及物,所以不用加介词.）
加油哈,英语好好学