1) He said '' I bought these books yesterday'' 2) She said '' I shall buy a new bike tomorrow'' 3) He said '' I and my brother learned English last year''

$\text{1}$ He said he had bought those books the day before . 

→ Quá Khứ Đơn → Quá Khứ Hoàn Thành 

→ Yesterday → the day before/the previous day 

$\text{2}$ She said she would buy a new bike the following day . 

→ shall → would

→ tomorrow → the following day 

$\text{3}$ He said he and his brother had learned/learnt English the year before . 

→ Quá Khứ Đơn → Quá Khứ Hoàn Thành 

→ last year → the year before/the previous year 

→ Câu tường thuật : S + said + (that) + S + V(lùi 1 thì) + O 

$\text{@Zyy}$