肯定句：主语+动词过去式+其他
例：I went to Beijing last week.
went 是动词go 的过去式
否定句：主语+didn't+动词原形+其他
例：I didn't go to Beijing last week.
一般疑问句：将Did提前
例：Did you go to Beijing last week
特殊疑问：特殊疑问词+一般疑问句
例：Why did you go to Beijing last week?