We guarantee that we will replace the defective item with the new one
completely free of charge.
We:主词 guarantee:及物动词
that we will
replace the defective item with the new one completely free of charge
->整坨作为guarantee的受词
结构为连接词that + S + Vt + O...名词子句 整坨当作guarantee的受词
内部结构:
we will replace the defective item with the new one
completely free of charge
phr.replace A with B 以/用 B (来/去)取代/替换 A
the new one completely free of charge
the new one
->定冠词the+属性adj+不定代名词one ...整坨为名词 符合with + 名词
one=item (以避免重复)
completely free of charge
->adv修饰free of charge
phr.free of charge adj.免费的
the new one completely free of charge
->定冠词the+限定adj+指称代名词one+adv+述语adj

http://en.wiktionary.org/wiki/free_of_chargefree of charge是副词例如: We guarantee that we will replace thedefective item free of charge. 也还是对的句子并不是勉为其难的"也"可以做副词解 在此它就是副词只是原po的句子让它刚好也可以用形容词来解释想想其他句子: replace the defective item with itcompletely free of charge 或 replace the defectiveitem free of charge. 就会让它无法以形容词解释或者replace it for you completely free of charge

免费换新品就是免费啊，哪来什么手续费商品费啊

谁说解释成"副词修饰动词" 就会有你说的第二种意思?所以像"replace the defective item free of charge"这里free of charge只能当副词解 就会出现语意的含糊??又或者你认为这里free of charge还是形容词?照你这样解释 刚刚wiktionary的例子:They were giving the tickets away free of charge.由于free of charge是副词 所以他们免费送出票的过程是不用钱的 但是票本身可能还是要再收钱??你说的就完全违背了free of charge的定义了阿Without any payment being required!

要判断一个phrase是不是adverbial，一个不错的方法是看这phrase能不能在句中移动，且仍保持整句原意:We guarantee that we will replace the defective item__free of charge__ with the new one. 这也是一个表达原意的说法。 前头 B 的例子只是刚巧没补上后头的"withthe new one"(他的句子也确实可以有多种解释，比如“免费换”(不会收任何费用)，但不是用全新品更换--只用"workingpart(s)"来更换(在美国)也是寻常）。不过呢，把"free ofcharge"当成adj(去形容那个"the new one")，以这角度来看整句反而会有这样子的意思--> 是更换"免费的新品"喔，我可没说不收你 labor charge, other fees ...但是这不是这个寻常说法的意思，所以以这角度来看没有意义