He calls his mom every Sunday.  - VERB - present tense - third person singular , I called but they didn't asnwer - VERB - past tense , "Maria! You have a phone call!" - NOUN , "Can you call my phone? I can't find it." - VERB - base form , "I was calling to tell you to bring a jacket, but you didn't asnwer." - present participle , Calling 911 is necessary if there is an emergency.  - gerund,

CALL

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