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Don't use the past perfect unless there is another verb in the past tense in the same sentence.
The infinitive simply names an action without reference to person, number or time. Therefore, it can't make sense without the help of a finite verb
Use the simple past tense to express a habit in the past, and not the past continuous
Use the past continuous tense to describe events in the past happening at the time another action took place: I was walking to school when I met him.
After the verbs can, must, may, shall, and will, use the infinitive without to , and not the third person of the present.