Building dams does change the environment.为什么change前要加does,d

The weather does not change very much How does the computer change your life What does the prince change the little girl into? Life does not change、Only love you the star. Does the weather change very often?做肯定回答 Does the weather change a lot in August in China? how does the crime rate on your campus change? what does she mean by change in the last sentence what does the meaning of "change one's mind" It is time to change the environment how does english change our life? Love you this life does not change