2. USED TO The expression used to is commonly used when talking about past habits. It means "something was true in the past, but it is not anymore." For example, I used to live in Toronto, but I don’t anymore. Now I live in Montreal. I used to ride a bicycle to school, but I don’t anymore. Now I drive a car. I used to be married, but I’m not anymore. Now I’m divorced.
3. USED TO NEGATIVE FORM I didn´t use toplaywithdolls. I usedtoplaywith cars. I didn´t use tostudyfrenchwhen I was a child. I didn´t use toreadpoetry in my childhood.
4. USED TO INTERROGATIVE FORM Didyou use toplaywithtoys? Yes, I did Didyou use toplaychess? Yes, I did