$\text{1.}$ The trees will be watered this afternoon.
$\text{→}$ Câu bị động thì TLD: S + will be + PP + (by)
$\text{2.}$ In my opinion, riding a horse is interesting.
$\text{3.}$ My school doesn't have as much trees as this park.
$\text{→}$ Khi viết lại câu so sánh hơn thì ta thường dùng so sánh bằng bị động.
$\text{4.}$ This book isn't mine.
$\text{5.}$ My father likes eating out.
$\text{→}$ cũng có thể dùng các từ: is keen on/ is interested in/ loves