`color{Pink}{\text{#Tina}}`

Nga asked Lan if/whether she often did her homework when she had free time.

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Ctrúc: 
S + asked + sb + if/whether + clause

Câu tường thuật - dạng Yes/No-questions 

S + asked / wanted to know / wondered + (O) +if/whether + S+ V (lùi thì)

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HTĐ --> QKĐ

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Đáp án: Nga asked Lan if she often did her homework when she had free time.

`color{orange}{~LeAiFuRuiHuiBao~}`