1. usually she wears trainers but today she is wearing high hells

обычно, постоянно-настоящее время- носит кросовки, но сегодня, процесс- продолжительное время - каблуки

2. he usually wathes TV but now he is reading a book

3. They usually wear blue shorts but today they are wearing a green ones

4. Usually we go swiming on mondey but today we are having a picnic