`1.` don’t stay
`2.` don’t wash
`3.` doesn’t do
`4.` don’t go
`5.` doesn’t open
`6.` don’t eat
`7.` don’t chat
`8.` doesn't use
`9.` don’t skate
`=>` Hiện tại đơn
`->` Ta có công thức như sau:
I,you,we,they + don't + V_inf
He,she,it + doesn't + V_inf