Present Simple
Structure: Subject + base verb (s/es for he/she/it)
Example: She walks to school every day.
Present Continuous
Structure: Subject + am/is/are + verb-ing
Example: They are watching a movie.
Present Perfect
Structure: Subject + has/have + past participle
Example: I have finished my homework.
Present Perfect Continuous
Structure: Subject + has/have been + verb-ing
Example: He has been studying since morning.
Past Simple
Structure: Subject + past form of verb
Example: We visited the museum yesterday.
Past Continuous
Structure: Subject + was/were + verb-ing
Example: She was reading a book at 8 PM.
Past Perfect
Structure: Subject + had + past participle
Example: They had left before we arrived.