学习英语的敲门砖（First Things First），讲练基本语音、语调（包括所有音标、连读、同化）及英语中的基本语法、词法、句法及句型结构知识。在学习时应跟着老师进行大量的语音语调练习、培养良好的发音习惯，为之后进一步学习英语打下良好基础。
一般过去时
表示过去发生的动作或事件，常和表示过去的时间状语连用，如yesterday, last night, the day before yesterday, 3 days ago...
含有be动词的句子，将be动词变为过去式。am, is的过去式为was, are的过去式为were：
I was at the butcher's.
You were a student a year ago.
The teacher was very beautiful ten years ago.
★变疑问句将be动词移动到句首
Were you at the butcher's?
Were you a student a year ago?
Was the teacher very beautiful ten years ago?
★变否定句在be动词后面加not
I was not at the butcher's.
You were not a student a year ago.
The teacher was not very beautiful ten years ago.
★肯定回答否定回答
Yes, I was. / No, I was not.
Yes, you were. / No, you were not.
Yes, he/she was. / No, he/she was not.
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