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现在进行时
现在进行时的构成：
由"be动词+ v-ing"构成。(V-ing表示在动词后面加上ing)
现在进行时常用以下几种情况：
1.当句子中有now时，常表示动作正在进行，这时要用现在进行时。
如：They are playing basketball now. 现在他们正在打篮球。
2.以look, listen开头的句子，提示我们动作正在进行，这时要用现在进行时。
如： Listen！She is singing an English song. 听，她正在唱英语歌。
3.肯定句式：主语 + be( am, is, are)+ V-ing +其它。
①I am doing my homework.
② He is washing his clothes.
③ You are flying a kite.
4.否定句式：主语 + be(am, is, are) +not + V-ing +其它.
① I am not doing my homework.
② He is not washing his clothes.
③ You are not flying a kite.
5.一般疑问句：Be(am, is, are) + 主语 + V-ing +其它？
① Are you doing your homework?
② Is he washing his clothes?
③ Am I flying a kite?