В косвенную речь
1. “I study hard,” she said. *
She said (that) she studied hard
She said (that) she study hard
2. “I am studying hard,” she said. *
She said (that) she is studying hard
She said (that) she was stydying hard
3. "I am not joking", said my friend. *
My friend sid (that) he/she isn't joking
My friend said (that) he/she was not joking
4. "We are going to the disco", my friend said. *
My friend said (that) they were going to the disco
My friend said (that) we were going to the disco
5. "I don't know", he said.
He said (that) he didn't know
He said (that) I don't know

1. She said (that) she studied hard

2. She said (that) she was studying hard

3. My friend said (that) he/she was not joking

4. My friend said (that) they were going to the disco

5. He said (that) he didn't know