1) usually I eat eggs for breakfast. Yesterday I had eggs for supper.
In this sentence, "eat" is in the present simple tense because it refers to a habitual action that happens regularly. "Had" is in the past simple tense, indicating a specific action that occurred yesterday.
2) Last week Dad and I made a big cake, because Mum had a birthday.
Here, "made" is in the past simple tense as it describes an action that took place last week. "Had" is also in the past simple tense, referring to the fact that Mum's birthday was an event that occurred in the past.
3) My brother usually buys toys for our little sister. Yesterday he bought a beautiful doll for her.
In this case, "buys" is in the present simple tense, which indicates a regular activity. "Bought" is in the past simple tense to describe the action that happened yesterday.
4) Different fruit trees grow in our garden. Last year Granny grew different vegetables in the country.
"Grows" is in the present simple tense, used for stating a general fact about the garden. "Grew" is in the past simple tense, indicating that Granny's action of growing vegetables happened last year.