$\text{21.}$
$\text{→}$ My teacher told me I shouldn't smke when I grew up.
$\text{→}$ My teacher advised me not to smoke when I grew up.
$\text{22.}$
$\text{→}$ My dad said to me I should work harder on his English.
$\text{→}$ My dad advised me to work harder on his English.
$\text{23.}$
$\text{→}$ Tom said he should learn French.
$\text{→}$ Tom advised himself to learn English.
$\text{24.}$
$\text{→}$ Ba said to Jane she shouldn't drive a car.
$\text{25.}$
$\text{→}$ Ngoc told Ha she should get up early and do aerobics.
$\text{→}$ Ngoc advised Ha to get up early and do aerobics.