Anglų skaidrės. What are Modal Verbs? Modal verbs do not take "-s" in the third person. You use "not" to make modal verbs negative, even in Simple Present and Simple Past. Many modal verbs cannot be used in the past tenses or the future tenses. Are you read to practice? Which sentence has a modal verb? Please choose the correct sentence. Please choose correct negative form of modal verb. "CAN" is used. Examples. "MAY". Examples. "must". Examples. Choose the best answer.