Khẳng định: S + have / has + been + V3/-ed + (by + O)
Phủ định: S + haven’t / hasn’t + been + V3/-ed + (by + O)
a/ Someone has cleaned the room.
b/ Jack has opened the gifts.
c/ They haven’t used these machines at least five years.
→ These machines haven’t been used at least five years.
d/ Have they delivered the package yet?
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0975 28 2009