Do you know how often he ____（锻炼）?He is so strong.exercise用加单三吗

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Do you know how often he ____（锻炼）?He is so strong.exercise用加单三吗
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Do you know how often he ____（锻炼）?He is so strong.exercise用加单三吗
Do you know how often he ____（锻炼）?He is so strong.exercise用加单三吗

Do you know how often he ____（锻炼）?He is so strong.exercise用加单三吗
要加单三形式,答案为：exercises
从句中he是主语,是第三人称单数,且从句的时态明显是一般现在时,所以答案用exercises没错.

exercises；,是，he为第三人称单数，后面动词加s

一般现在时，要用单三，填exercises.
望采纳，O(∩_∩)O

不用加三单，do you know 做插入语，可不计考虑，how often 提问不用，回答用

practise

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