while I was doing my homework ,I heard a Strong noise （同義句轉換

題目：

while I was doing my homework ,I heard a Strong noise （同義句轉換）

解答：

When I heard a Strong noise ,I was doing my homework .
或 I was doing my homework when I heard a Strong noise
注意 以上兩句 意思 並不完全一樣 前者是複合句 後者是並列句