be动词的陈述句变成疑问句,把be动词直接提前就可以了.（注意换标点符号）
例：
I am a good boy. → Am I a good boy ?
我是个好孩子.→我是个好孩子吗?
You are tired. → Are you tired ?
你累了.→你累吗?
He/She is helpful. → Is he/she helpful ?
他/她 乐于助人.→他/她 乐于助人吗?
使用一般动词的陈述句变成疑问句,就需要借助助动词do来完成了.
句型：Do + I/you/they/复数名词 + 动词原形
Does + she/he/it/单数名词 + 动词原形
例：（注意换标点符号）
I like books. → Do you like books ?
我喜欢书.→你喜欢书吗?
You play computer games every day . → Do you play computer games every day ?
你每天都在玩电脑游戏.→你每天都在玩电脑游戏吗?
They have a lot of time. →Do they havea lot of time ?
他们有很多时间.→他们有很多时间吗?
She eats much. → Does she eat much ?
她吃得多.→她吃得多吗?
He washes his own clothes. → Does he wash his own clothes ?
他自己洗衣服.→他自己洗衣服吗?
It blows a lot in the north of China. → Does it blow a lot in the north of China?
中国的北方经常刮风.→中国的北方经常刮风吗?