where simple past tenses and  past perfect tenses are used and what are there structures ? Please someone tell me the answer as fast as you can please guyz ..........

Simple past tense indicates the idea that an action was finished in the past. 

Structure: Subject+ II form of verb+ object

Example: The plane took off at 3 o'clock.

Past perfect tense indicates that an action completed before a certain moment in the past.

Structure: Subject+ had+ III form of verb+ object

Example: When I reached the airport, the plane had taken off.

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Simple Past is used to express the idea that an action started and finished at a specific time in the past.

STRUCTURE: Subject+main verb (2nd form) + Object

The  Past Perfect expresses the idea that something occurred before another action in the past. It can also show that something happened before a specific time in the past.

STRUCTURE : Subject + had+ main verb (third form) + Object 

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