There are 12 tense/aspects in the English language.
The simple tenses- present, past and future
The continuous tenses-present, past and future
The perfect tenses-present, past and future
The perfect continuous tenses-present, past and future
There are three simple forms- present, past, and future.
The simple tenses are used to indicate when in time actions or events occurs.
There are three continuous forms- present, past, and future.
The progressive tenses give the idea that an action is in progress at a particular time. The action can begin before another action, be in progress during another action, or can continue after another time or action. The continuous forms are used when viewing an action as occurring over a period of time and as incomplete in some way.
There are three perfect forms- present, past, and future.
The perfect forms are used when looking back on actions or events that have occurred in the past.
There are three perfect continuous forms- present, past, and future.
The perfect continuous tenses are a combination of the perfect and the continuous tense. As with the perfect tenses, the perfect continuous tenses are used when looking back on actions or events.
For more information about verb tenses and their used take a look at
An explanation verbs of the different verb tenses and aspect-www.understandinggrammar.com