what is the correct verb form of "tener" for this sentence?
Complete the sentence with the correct form of the verb tener. (Completa la frase con la forma correcta del verbo tener.) ¿Cuántos años _________ellos?
Sí ¡Muy bien!
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If you need to check any form of the verbs you want to conjugate, click on "more" above and then on "conjugation". You'll end up here - type in the infinitive of a verb and you'll get it conjugated.
Tienen is the choice. Tener is an irregular verb so the Ellos/Ellas form would be Tienen.
The safest answer is "tienen", which is the present tense 3rd person plural form. Though it is possible that it is in another tense, so the answer could be something else. Now, agreeing with everyone's comment listed above, you would have to do some work here. Anyway, I bet the answers to most of your questions could be found using the resources available on this site.
Try posting your answer first and we'll check it. This is not a "do-my-homework" website.