"do"和"does"是英语中的助动词,它们主要用于构成疑问句和否定句,也可以用来强调。以下是它们的基本用法:
1. 构成疑问句
在构成一般现在时的疑问句时,"do"和"does"的用法取决于主语:
第一人称和第三人称单数使用 "do"。
I do [动词原形]。
He/She/It does [动词原形]。
第二人称和复数主语使用 "do"。
You/We/They do [动词原形]。
例如:
Do you like this book?
Does he go to school every day?
2. 构成否定句
构成否定句时,通常在动词前加上 "not"。
I do not like this book.
He does not go to school every day.
3. 强调
"do"和"does"也可以用来强调句子中的动作或状态。
You do know this, don't you?
She does work hard, doesn't she?
4. 一般现在时
在一般现在时中,"do"和"does"通常用于询问习惯性动作或状态。
Do you eat breakfast every morning?
Does she have a cat?
5. 现在完成时
在现在完成时中,"do"和"does"用于构成疑问句和否定句。
Have you done your homework?
Does she have finished her work?
使用时,请根据句子中的主语和时态选择正确的形式。
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