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Mother told Tom to watch the milk until it boiled and then__

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Mother told Tom to watch the milk until it boiled and then__off the gas. 为什么是 turn.不是turned
详细点
这是tell sb to do A and do B 的结构
 
told 之后有两个不定式短语做宾补
to watch the milk until it boiled
to turn off the gas
当两个不定式被并列连词and 等连起来时第二个不定式常省去to
所以此空为动词原形
 
 
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