1.
$\text{1.}$ When I was ten, I began playing football.
$\text{→}$ began/ started + V-ing
$\text{2.}$ In the future, my father will go abroad.
$\text{→}$ In the future ⇒ TLD
$\text{3.}$ Reading books in my free time is my favourite hobby.
$\text{→}$ V ở đầu câu thường thêm -ing
$\text{4.}$ I think skating is more interesting than mountain - climbing.
$\text{→}$ think + N/ V-ing + is + adj
$\text{5.}$ I don't know why my mother likes cooking.
$\text{→}$ like + V-ing
$\text{6.}$ He will collect books whenever he has money.
$\text{→}$ whenever: bất cứ khi nào
$\text{7.}$ How many paintings has she painted?
$\text{8.}$ I love flowers, so I plant them around my house.