$\text{5.}$ works 

$\text{→}$ every day chia HTD

$\text{6.}$ go

$\text{→}$ always chia HTD

$\text{7.}$ eats

$\text{→}$ every day chia HTD

$\text{8.}$ starts

$\text{→}$ every night chia HTD

$\text{10.}$ is

$\text{→}$ she là S số ít ⇒ dùng is

$\text{11.}$ don't understand

$\text{12.}$ doesn't - work 

$\text{→}$ usually chia HTD

$\text{13.}$ Does - teach

$\text{→}$ Mrs. Hanh là S số ít ⇒ dùng does

$\text{14.}$ Do - study

$\text{→}$ many students là S số ít ⇒ dùng do

$\text{15.}$ doesn't come

$\text{→}$ Vinh là S số ít ⇒ dùng doesn't

$\text{16.}$ Does - go

$\text{→}$ usually chia HTD

$\text{17.}$ Does - visit 

$\text{→}$ always chia HTD

$\text{18.}$ Do - go

$\text{→}$ often chia HTD

$\text{19.}$ Do - meet

$\text{→}$ usually chia HTD

$\text{20.}$ does - do

$\text{→}$ every morning chia HTD

$\text{21.}$ have

$\text{→}$ câu hỏi có trợ V thì V để nguyên

$\text{22.}$ has

$\text{→}$ Minh là S số ít  ⇒ dùng has

$\text{23.}$ doesn't have

$\text{→}$ Ms. Lan là S số ít ⇒ dùng doesn't

$\text{24.}$ is

$\text{→}$ water ko đếm đc ⇒ dùng is

$\text{25.}$ isn't

$\text{→}$ It là S số ít ⇒ dùng isn't