* "Is" is the singular form of the verb "to be" in the present tense.
* "Has" is the singular form of the verb "to have" in the present tense.
* "Does" is the singular form of the verb "to do" in the present tense.
Why are they singular?
These verb forms are singular because they are used with singular subjects. For example:
* She is happy.
* The cat has nine lives.
* He does his homework.
Plural forms:
The plural forms of these verbs are:
* Are
* Have
* Do
These are used with plural subjects:
* They are happy.
* The cats have nine lives.
* They do their homework.