Final answer:
Transforming a statement to direct speech involves quoting the exact words spoken and adding a speech tag to indicate who is speaking; for example, "Why do you need to go to the shop?" my mum asked.
Step-by-step explanation:
To change a statement to direct speech, you need to quote the exact words that were spoken and include the person who is speaking. For the sentence 'My mum wanted to know why I needed to go to the shop,' you would convert it into direct speech by writing what the mum actually said. It would look something like this:
"Why do you need to go to the shop?" my mum asked.
Notice that direct speech will always include quotation marks to indicate the exact words spoken and it might include a speech tag (e.g., 'my mum asked') to show who is speaking.