肯定句：我有一本书
I have a book .
疑问句：我有一本书吗 ？
Do I have a book ?
疑问句： 我何时有一本书 ？
When do I have a book ?
当我们要问对方“什么时候”，就需要使用到“When” 疑问词
When的用法和前面所学的“What”“Why”相同，都必须放在句首形成疑问语气。
1．他何时教我英文？
When does he teach me English ?
2．你何时教她英文？
When do you teach her English ?
3．他何时教我们英文？
When does teach us English ?
4．你有什么（东西）？
What do you have ?
5．他有什么（东西）？
What does he have ?
6．你在哪里教他？
Where do you teach him ?
7．他在哪里教你们？
Where does he teach you ?
8．为什么你教我们英文？
Why do you teach us English ?
9．为什么我教他们英文？
Why do I teach them English ?
10．他如何教我历史？
How does he teach me history ?
11．你们如何教她历史？
How do you teach her history ?
when 也可以当作连词使用，用法与 because 用法一至：
当“when”放在句首时＝“when＋句1＋，＋句2”
当“when”放在句中时＝“句1＋when＋句2”
1．当他是忙碌的，他是生气的。
When he is busy,he is angry.
2．当那只鸟在树上，它是快乐的。
When the bird is in the tree ,it is happy
3．当那只猴子在我的花园玩，它是快乐的。
When thay monkey plays in my garden ,it is happy.
4．当李（Lee）先生教玛丽英文，她是开心的。
When Lee teaches Mary English , she is happy.
5．他是生气的当他是忙碌的。
He is angry when he is busy .
6．那只鸟是快乐的当它在树上。
That bird is happy when it is in the tree .
7．这只猴子是快乐的当它在我的花园里玩。
This monkey is happy when it plays in my garden .
完毕
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