Modal Verbs: can

Modal Verbs: can

Can is a modal verb that can be used to indicate ability, permission, or possibility. Here's how it can be used in different tenses and forms: present, future, indefinite passive, indefinite infinitive

Modal Verbs: must

Modal Verbs: must

Must with the indefinite infinitive is used in the present to express a strong obligation, necessity or deduction.   Examples: I must study for my exam. (strong obligation)  

Auxiliary Verbs: to be

Auxiliary Verbs: to be

To be is used with the present participle (ing form) of the main verb to indicate an action that is currently happening.   Example: She is studying for her exam.

The Present Perfect Continuous tense

The Present Perfect Continuous tense

The Present Perfect Continuous tense is used to describe an action that began in the past, has continued up until now, and may still be ongoing. It is typically used to describe actions or situations that have a connection to the present moment.