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:
2. You use “not” to make modal verbs negative
Examples:
3. Many modal verbs cannot be used in the past tenses or the future tenses.
Examples:
Can Could May Might Must | Ought to Shall Should Will Would |