`13.` learns
`->` He/She/It + V-es/s + `(O)` + every year.
`15.` smokes
`->` Mark = he + V-es/s + thời gian + a day.
`16.` finishes
`->` Mai = she + V-es/s + `(O)` + at + time
`17.` sells
`->` she + V-es/s + `(O)` + in/at + the + place
`18.` doesn't eat
`->` My sister = she + doesn't + V-nguyên thể +....
Tất cả bài trên đều dùng thì HTĐ (present simple) nhé.
$@Sao$