- Past Perfect ( Quá khứ hoàn thành)
`1.` eat `->` had eaten
`2.` chop (mình nghĩ là chop bởi vì nó là V) `->` had choped
`3.` drink `->` had drunk
`4.` OK `->` had Ok'd (nếu Ok là V thì sẽ chia là OK'd ở thì QK)
`5.` ∅ (ko thể bởi autumn là danh từ)
`6.` discover `->` had discovered
`7.` buy `->` had bought
`8.` swimming (đã chia ở V-ing thì ko thể chia ở thì QKHT, nhưng nếu là swim `->` had swum)
`9.` sleep `->` had slept
`10.` wear `->` had worn
- V chia ở thì QKHT = had + VpII
( + ) S + had + VpII + ...