Change the words in bold from affirmative to negative, or negative to affirmative

Câu hỏi :

Change the words in bold from affirmative to negative, or negative to affirmative, to make sentences. (Chuyển các từ in đậm từ khẳng định sang phủ định hoặc phủ định thành khẳng định để đặt câu.)

1. Most children can read until they're six.

2. Mozart couldn't compose music when he was five.