`1` If we raise enough money, we will build a shelter for these homeless youths.
Cấu trúc: Câu điều kiện loại 1: If+ S+ V(s/es), S+ will/ can/ may+ V-inf.
`2` Recently they have planted trees in areas.
Vì recently là HTHT: S+ have/ has+ Vp2.
`3` Because Tony thinks charity is good and warm a lot, he donates clothes.
Cấu trúc: Because+ clause 1, clause 2.
`4` Can I paint these graffiti words over a mural wall?
Cấu trúc: modal V: S+ modal V+ V-inf.
`5` Have you registered for the green summer campaign yet?
Vì yet là HTHT: S+ have/ has+ Vp2.