Առաջադրանքի/խնդրի պայմանը

2Մ.
Insert the modal verb can or could or their negative forms (can't/couldn't). Write down only the modal verb/verbs as it/they should be written in the sentence. If there are two verbs, separate them with a comma.
  
Father was the only one who _____ understand me, but now he _____ either.
 
Answer: