SIMPLE PAST
We use the past simple for:
Actions that started and were completed at a specific time in the past. We bought our house five years ago.
Habitual or repeated actions in the past. I always went to bed early when I lived with my parents.
For completed actions that happened one after the other in the past. Yesterday I got up at 8:00, had a breakfast and left for school.
Time expressions
Yesterday /yesterday morning, etc.
Last night week weekend month year
Last Wednesday / Friday, etc.
Last summer / Winter, etc.
Two days / A week / Three months.
Five years ago in + year
THE VERB COULD
Couldn't is the past tense of can.
We use it to talk about ability in the past. My sister could play the piano when she was seven.
ADVERBS / ADJECTIVES
Adjectives describe nouns.
Adverbs of manner describe how something happens.
USED TO
We use "Used to" to talk about something that happened regulary in the past but no longer does.
We used to go skateboarding every afternoon when we were young.
PERSONAL PRONOUNS
Subject personal pronouns are used as subjects and go before the verb.
Look at that girl, she's beautiful.
Object personal pronouns are used after verbs as objects after prepositions.
Look at him!, He's my brother.