First thing: you're using "part pas" as a short form for "past participle," right? That short form is likely to confuse some people, since it's not commonly used in English grammar books. Just wanted to let you know. You seem a bit confused about English tenses so let me give you a really basic overview. English has 4 past tenses: 1. Simple past, e.g. - I walked 2. Imperfect/past continuous, e.g. - I was walking 3. Past perfect, e.g. - I had walked 4. Past perfect continuous, e.g. - I had been walking Note that #1 has no auxiliary verb, #2 uses "to be" as an auxiliary, and #3 and #4 use "to have" as an auxiliary. #1 and #2 are the most common. English also has two present tenses that make some reference to the past (there are other present tenses I am not listing here; I am only listing the ones that are easily confused with past tenses): 1. Present perfect, e.g. - I have walked This is when you're talking in the present about something you have already finished. "I have cooked enough food for everyone." "I have seen problems like this before." 2. Present perfect continuous, e.g. - I have been walking This is when you're talking about something that started in the past but is still going on in the present. "I have been walking for 3 hours and I am almost there." "I have known him for 4 years and we're still good friends." Both of these use "to have" as an auxiliary. They can be hard to get right, and they seem to be the ones confusing you most. - Many of the examples you give are wrong: I've become father a long time ago - wrong I became a father a long time ago - right I've gone to holiday last year - wrong I went on holiday last year - right The document has been written with a error - wrong The document was written with an error - right I was borned in 1971 - wrong I was born in 1971 - right