Correct: I have learned English for 4 years. , She hasn't seen her friend for 1 year. , They have seen the movie twice., We have never been to HCMC., I have had my computer since 2011. , Incorrect: I has learned English for 4 years., She hasn't seen her friend since 1 year. , They have saw the movie twice., We have ever been to HCMC., I have had my computer for 2011.,

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