摘要: 学习动词to be的一般现在时肯定句.否定句.疑问句及其肯定和否定回答形式.板书: To be à am/is/are The verb `to be’ has three forms in the simple present tense--`am’, `is’ and `are’. When do we use `am’? When do we use `is’? When do we use `are’? Think them over and look at the table on page 12. 出示幻灯片上的习题: 1) We use `am’ when the subject is (I). We use `are’ when the subject is or . We use `is’ when the subject is or (it). 2) Negative forms of the verb `to be’ in the simple present tense are: I / - We/You/They / - He/ She/ It / -

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