Переделать предложения в отрицат. и вопросит. форму:
Aeroplanes make children happy.
Children learn while playing.
Dolls of wood, clay and wax were also very popular with girls.
Tool kids, thains, cars, trucks and garages gave them an interest in engineering.
Both boys and girls, loved their rocking horses, and teddy bears.
They used mud.

Aeroplanes don’t make children happy. 

Do aeroplanes make children happy? Children don’t learn while playing.

Do children learn while playing?

Dolls of wood, clay and wax weren’t also very popular with girls.

Were dolls of wood, clay and wax also very popular with girls?

Tool kids, thains, cars, trucks and garages didn’t give them an interest in engineering.

Did tool kids, thains, cars, trucks and garages give them an interest in engineering.

Both boys and girls,didn’t  love their rocking horses, and teddy bears.

Did Both boys and girls, love their rocking horses, and teddy bears? They didn’t use mud.

Did they use mud?