Поставьте предложения в вопросительную и отрицательную форму: 1 my sister decided to do it herself. 2 she helps me with my english. 3 ann has just received the letter.

1 My sister didn’t decide to do it herself.
2 She doesn’t help me with my English.
3 Ann hasn’t just received the letter.

1 Did your sister decide to do it herself?
2 Does she help you with your English?
3 Has Ann received the letter?