Verb Tense rules
A verb indicates the time of an action or condition by changing its form. Past, present, and future tenses are the most common forms.
the simple forms Simple present is used to describe customary or habitual actions and general truths. I walk to school every day.
simple past: use to describe actions that took place in the past. Sam mailed the letter yesterday.
simple future: use to describe actions that are expected to take place after the present. I shall clean my room tomorrow.
progressive forms present progressive: use to describe actions occurring now. I am studying English now.
past progressive: use to describe an action that was occurring at a specific time in the past. My neighbors were cleaning when I came to visit.
future progressive: use to describe actions that will be in progress in the future I shall be smiling when my mom arrives.