Косвенная речьMary says: "I am am school every Saturday". Nick asks:"Did you visit Granny?"

Mary says: "I am at school every Saturday". - Mary says that she is at school every day.

Nick asks:"Did you visit Granny?" - Nick asks if I visited Granny.

If the first part is in Present we don't change tense in the second part.

The first part Mary says, Nick asks - Present Indefinite.

In these sentences only pronouns are changed, I - she, you - I.

In the first sentence we add or don't add that.

The second sentence is interrogative and it hasn't an interrogative word, so we add if.