Modal Verbs

What are Modal Verbs?

Modal verbs are special verbs which behave very differently from normal verbs. Here are some important differences:
1. Modal verbs do not take "-s" in the third person.
Examples:
  • He can  speak Chinese.
  • She should  be here by 9:00.
2. You use "not" to make modal verbs negative, even in Simple Present and Simple Past.