① I don’t know what this is.
② Do you know where he lives?
③ I don’t know why he is angry.
④ Could you tell me what you want?
⑤ Do you know what time it is?
⑥ May I ask where you are from?
⑦ Aya lived in Canada when she was young.
When Aya was young, she lived in Canada.
⑧ Aya didn’t go to school because she had a cold.
⑨ I will make sandwiches if you are hungry.
⑩ I know that my mother is busy.
⑪ I think that this book is interesting.
⑫ I don’t know if he will come to school.
⑬ May I ask if you will come here tomorrow?
⑭ I have a friend who can speak English.
⑮ I know the man who took this picture.
⑯ This is a book which changed my life.
⑰ The picture which he took was beautiful.
⑱ Whose is the cake which was on the table?
⑲ Do you know the man who stole my notebook?
Do you know who stole my notebook?