1.) Grammar rules were learned by heart
Grammar rules we learn by heart
Grammar rules you will learn by heart.
2.) Rare animals were protected in many countries
Rare animals are protected in many countries.
Rare animals will be protected in many countries
3.) This scarf was made by my granny.
This scarf will make by my granny
This scarf makes by my granny
ПРОВЕРЬТЕ ПОСТРОЕНИЕ ПРЕДЛОЖЕНИЙ ЕСЛИ ЕСТЬ ОШИБКИ СООБЩИТЕ.
Есть ошибки в построении предложений с Пассивным Залогом:
This scarf will be made (Future Simple Passive)
This scarf is made (Present Simple Passive)