Project 34365: part 92

(九十二/三百六十五）
今天是二〇一四年三月五日。
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[P1 have + past participle] (attempt 2)

我修理过火车。--if you want to say you have reapaired the train,you are right. 
我走过家。-- what you say means "you walk passed your home"but not "you walk home",you should say"我走路回家“
今天,我不吃过早饭。--“today,i didn't have breakfast”,you should say"今天，我没有吃早饭”

不是所有过去式的句子都能用“过”，虽然那是表示过去的事情。

Project 34365: part 92

(九十二/三百六十五）
今天是二〇一四年三月五日。
----

[P1 have + past participle] (attempt 2)

我修理过火车。
我走过家。
今天,我不吃过早饭。 (今天，我没吃过早饭）

Project 34365: part 92

(九十二/三百六十五）
今天是二〇一四年三月五日。
----

[P1 have + past participle] (attempt 2)

我修理过火车。
我走过家。                What does this mean? Do you mean, "I had gone/walked back to my house",  if this is the case, then it should be, 我回过家了
今天,我沒有不吃过早饭。Think of 不 as negation as "un", 沒 = haven't 

我不吃 = I don't eat vs 我沒吃 = I haven't eaten = I didn't eat.  There lies in your confusion. Even in English, there's a big difference in meaning of these two phrases.