Paolo gave me his word that he wouldn't tell anyone.

gave 是动词 give 的过去式，意思是"给予"。 me 是人称代词 I 的宾格形式，意思是"我"，在句中作间接宾语。 his 是形容词性物主代词，意思是"他的"，用来修饰名词 word。 word 在这里不是指"单词"，而是指"承诺、保证"的意思。 gave me his word 是一个固定搭配，字面意思是"把他的承诺给了我"，实际意思是"向我保证"。