Теория:

Read the information about reported statements.
  
When we report statements, we use say or tell. Also we change pronouns, possessive adjectives and tenses.

Study the table.
 
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Examples:

“ I want to go on holiday”, Mary said
Mary said (that) she wanted to go on holiday. (present simple - past simple)
  
“We visited many castles last year”, Mary said.
Mary said (that) they had visited many castles the year before. (past simple - past perfect)
  
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“I will send you some cards”, Kate said.
Kate said (that) she would send them some cards. (future simple - would + V1)
  
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Remember these changes with words.
 
Direct Speech                      
Reported Speech                   
tonight, today, this week/month/yearthat night, that day, that week/month/year
nowthen, at that time, at once
yesterday, last night/week/month/yearthe day before/the previous day, the previous night/week/month/year
tomorrow, next week/month/yearthe day after/the following day/week/month/year
two days/months/years agotwo days/months/years before
this, thesethat, those/the/some
herethere
comego
Источники:
www.medievalarchives.com
www.theguardian.com
www.emaze.com