`1.` He hasn't seen a tiger before 

`-` Thì Hiện Tại Hoàn Thành, "before" là DHNB

`-` Cấu trúc: S + have/has + Vp.p + ...

`2.` Yesterday, my father took me to school

`-` Thì QKĐ - yesterday là DHNB, cấu trúc: S + Ved/Vc2 + ....

`3.` Minh doesn't like fish and his brother doesn't,either 

`-` Thì HTĐ: S + do/does + not + V-inf + .. 

`4.` I am looking forward to visiting my grandparents

`-` Cấu trúc: look forward + to V-ing 

`5.` In the furute, many people will travel by flying cars

`-` Thì TLĐ - in the future là DHNB, cấu trúc: S + will + V-inf

`1` He hasn't seen a tiger before

`+` Dùng thì HTHT `-` DHNB : before

`->` Cấu trúc : S + have/has + not + V-ed/V3

`2` Yesterday my father took me to the school 

`+` Dùng thì QKĐ `-` DHNB : yesterday

`->` S + V2/ed + ..

`3` Minh doesn't like fish and his brother doesn't , either

`->` S + don't/doesn't + V-inf

`->` S + trợ động từ , either

`4` I am looking forward to visiting my grandparents

`->` Cấu trúc : S + be + looking for ward to + V-ing

`5` In the future, people will travel by flying cars

`+` In the future : trong tương lai `-` Dùng thì TLĐ

`->` Cấu trúc : S + will + V-inf

`->` by + phương tiện giao thông