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If i'm talking about completed actions at an unspecified time in the past, should i automatically use the persent perfect ? Or only if it's describing the present result of completed action ?

Second question : is it possible to use past simple with an unspecified time period ?

closed as off-topic by user178049, Nathan Tuggy, shin, Glorfindel, Rompey Apr 27 '17 at 9:10

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  • "This question should include more details than have been provided here. Please edit to add the research you have done in your efforts to answer the question, or provide more context. See: Details, Please." – Nathan Tuggy, shin, Glorfindel, Rompey
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    We cannot answer the question without a sufficient context. So please edit your question to add it. Btw, don't forget to capitalize the pronoun "I". – user178049 Apr 27 '17 at 5:58
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    In English it mostly depends on what you've got to say and your personal author's view. Context is required. – SovereignSun Apr 27 '17 at 7:07
  • I'm walking with my friend and there is a house, So I should tell him my father has built this house or just past simple? – Abc Apr 27 '17 at 9:19

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