$\text{1.}$ I asked Tom if he had done that.
$\text{→}$ QKD ⇒ QKHT
$\text{2.}$ The father asked the man if he was going to marry his daughter.
$\text{→}$ are ⇒ was <vì the man là số ít>
$\text{3.}$ He asked her if her teacher was getting angry.
$\text{4.}$ I asked him if he was happy.
$\text{→}$ are ⇒ was <vì he là số ít>
$\text{5.}$ They asked me if I didn't know how to speak English?
$\text{→}$ HTD ⇒ QKD
$\text{→}$ Những câu trên đều là câu hỏi mà có câu trả lời là yes/ no nên thêm if.