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一概念现在进行时表示现在或现阶段正在进行或发生的动作。常与now,today,these days等连用,例如: I’m writing a letter now.我正在写信。They are learning to dance this week. 这一周他们在学习跳舞。二构成1.现在进行时是由“助动词be(am,is,are)+ving”构成。其中的助动词be应与主语在人称和数上保持一致,即第一人称单数I作主语时,用am;第三人称单数he,she,it等作主语时,用is,其余人称做主语时,用are。例如: Tom is flying a kite. They are listening to the teacher. 2.现在进行时的肯定、否定及疑问句式都是通过be动词来实现的,即否定式是在be动词后加not构成,其疑问句式是将be动词的相应形式前移句首构成。She is cleaning the classroom.(肯定句) She isn’t cleaning the classroom.(否定句) Is she cleaning the classroom?(一般疑问句)
A concept now represents an action that is ongoing or occurring now or at the current stage. Often used with now, today, these days, etc. For example: I’m writing a letter now. They are learning to dance this week. They are learning to dance this week. The second structure 1. The current process is composed of the auxiliary verb be(am,is,are)+ving. The auxiliary verb be should be consistent with the subject in terms of person and number, ie, when the first person singular I is the subject, use am; the third person singular he, she, it etc. as the subject, use is, and the rest is called the subject. Are. For example: Tom is flying a kite. They are listening to the teacher. 2. The affirmative, negative, and interrogative sentence patterns are now implemented by be verbs. That is, the negation is formed by adding not after the be verb. The formula consists of moving the corresponding form of the be verb into the beginning of the sentence. She is cleaning the classroom. She is cleaning the classroom. (Issue sentence) She is cleaning the classroom.