a)"I must go home to make dinner",he said.
▪︎She said she had to go out to post a letter.
b)"I spoke to Jane last week",she said.
▪︎She said she had spoken to Jane the week before / the previous week.
c)"I'll phone the office from the airport",she said.
▪︎She said she would phone the office from the airport.
d)"I can't speak any foreign languages",he said.
▪︎He said he couldn't speak any foreign languages.