把该句子拆成2句
1.He is only too ready to help others.
2.He seldom refuses them when they turn to him if he ever refuses them.
再把这两个句子组合,1.为主句,2.中的主句He seldom refuses them when they turn to him 变为现在分词形式作状语,从句 if he ever refuses them省略为if ever做插入语
把该句子拆成2句
1.He is only too ready to help others.
2.He seldom refuses them when they turn to him if he ever refuses them.
再把这两个句子组合,1.为主句,2.中的主句He seldom refuses them when they turn to him 变为现在分词形式作状语,从句 if he ever refuses them省略为if ever做插入语