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sing→ singing
What is he doing now?
He is
playing basketball.
play→playing basketball
What is she doing?
She is
swimming.
swim→swimming
What are they doing?
They are dancing.
想一想
I am singing.
He is playing basketball.
She is swimming.
They are dancing.
请归纳这些句子有什么共同特点
共同点: be 动词+动词ing ↓
现在进行时（The Present Progressive Tense)
定义: 表示现在（说话瞬间）正在进行或发生的动作。
结构: 主语 + be 动词 + 动词ing
I am singing.
He/She/It is dancing.
We/You/They are running.
动词ing（现在分词）的构成规则
1.一般情况是在动词原形的词尾加ing。如：
go→going look→looking ask→asking
2.以不发音字母e结尾的动词,去掉e，再加ing。如：
take→taking make→making write→writing
3.以重读闭音节结尾的动词，末尾只有一个辅音字母，双写这个辅音字母，再加ing。如：