The document discusses the present perfect passive tense in English. It contains the form, which is subject + have/has + been + past participle + optionally (by + object). It also provides examples of sentences in the active voice and their equivalent in the passive voice using the present perfect passive tense, such as "Someone has cleaned the room" becoming "The room has been cleaned". Additionally, it shows negative examples and a question using the present perfect passive tense.

1. THE PRESENT PERFECT PASSIVE (Thì hiện tại hoàn
thành thể bị động)
1. Form:
Khẳng định: S + have / has + been + V3/-ed + (by + O)
Phủ định: S + haven’t / hasn’t + been + V3/-ed + (by + O)
2. Examples:
a/ Someone has cleaned the room.
→ The room has been cleaned.
b/ Jack has opened the gifts.
→ The gifts have been opened by Jack.
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?
→ Has the package been delivered yet?