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Father93 Posted 14 years ago
Grammar

either

Can either of your parents speak/speaks French. And why ?
  

Top answer

Can ... speak Can, could; shall, should; will, would; may, might; must and ought are defective/modal auxiliaries or auxiliary verbs. They always take a plain/bare infinitive except ought , which takes an infinitive with 'to': You ought to see it.

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2 Answers
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Can ... speak

Can, could; shall, should; will, would; may, might; must
and ought are defective/modal auxiliaries or auxiliary verbs. They always take a plain/bare infinitive except ought, which takes an infinitive with 'to': You ought to see it.

Speaks is not an infinitive; it's a present tense 3rd person singular verb
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The verb is "can speak"—auxiliary + infinitive.