... The present perfect tense (Hiện tại hoàn) I/ Form S+ have/ has+ V( past participle ) II/ Adverbs of time +,Since ... after have / has or at the end of the sentence ) +,Yet( in negative or yes-no question ) +,So far , up to now, up to present , since then ... +,In recent years , this month , for / during the ... started in the past lasting up to present and still likely to happen in the future : Ex : He has lived in Haiduong for 6 years 2/ An action in the past but present result: Ex : She has bought...