be, do, have and modal verbs in the Present Simple
How to use special verbs in the Simple Present
1. be as a main verb
We often use the short/contracted forms with this verb.
2. do as a main verb
3. have as a main verb
4. Modals can, could, may, must, need, will etc.
► We can substitute don’t (can‘t) for do not (cannot).
Modals have the same form every time regardless the subject. We do not add an -s to the infinitive.