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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