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Ⅱ、构成形式:
肯定式 主语 + be (am/is/are)+表语 I am a student. It/ She/He is a teacher. You/They are classmates. 主语 +情态动词(can, must, may, need, shall) I can speak English. She must go to school.
变否定句:I don’t run very fast . e.g. I run very fast.
变否定句:She doesn’t like Maths.
肯定否定回答:Yes, she does. No, she doesn’t.
肯定否定回答:Yes, I do. No, I don’t. e.g. She likes Maths.
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注意:在一般现在时态中,当谓语动词是行为动词的时候,变否定和一般疑问句时,要借助助动词do和does帮忙。当主语是第三人称单数(she, he, it)的时候用does,其他人称用do. 借助助动词do和does以后,动词要用动词原形。
1、表示目前或现在存在的状态或特征. e.g. She is often late. 2、表示客观存在及普遍真理。 e.g. The earth is round. 3、表示现在经常和习惯性发生的动作,常与 sometimes, often, usually, always, everyday… 等时间状语连用。 4、在时间状语从句中表示将来发生的动作。 e.g. If it doesn’t rain tomorrow, we’ll go to the park. 5、表示按时间或计划将要发生的动作,常与时 间状语连用,常用动词为: come, begin, go, leave, arrive, stop, start, return, E.g. Our holidays begin in a week.