1.Tom went to park last week.
否定句：Tom didn't go to the park last week.
一般疑问句：Did Tom go to the park last week?回答：Yes,he did.No,he didn't.
2.We usually have two English classes on Wednesday.
否定句：We don't have two English classes on Wednesday.
一般疑问句：Do you often(usually) have two English classes on Wednesday?回答：Yes,we have.No,we haven't.