$\color{black}{1}$

→ He didn't go to the party two days ago

→ S + V2/Ved + O +...

→ S + Didn't + V + O +...

→ Did + S + V + O +....

$\color{black}{2}$

→ Unless i have a quiet room , I won't be able to do anything

Unless = if....not ( Câu dk loại 1 )

$\color{black}{3}$

→ The nurse is kind enough to help him to walk

$\color{black}{4}$

→ He prefer spending his holiday on a farm than at the seaside

→ Prefer + ving

$\color{black}{5}$

→ I will return from a visit to japan next summer

S + Will + V

DHNB : Next Summer