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If you begin with a verb referring to past time, keep the verb forms in the past. The same rule applies to tenses throughout a composition.
We also use the present continuous for the future when something is pre-arranged or expected with some certainty: Lorna is arriving tomorrow at six. Tom and I are eating out tonight
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.
Don't use the past perfect unless there is another verb in the past tense in the same sentence.