作谓语时动词加ing前面必须加上be动词,形成be 动词ing(现在分词)作句子谓语,构成进行时态句子。
He is listening to music now.
他正听音乐。
We've been waiting for them for two hours.
我们等他们两个小时了。
作谓语时动词加ing前面必须加上be动词,形成be 动词ing(现在分词)作句子谓语,构成进行时态句子。
He is listening to music now.
他正听音乐。
We've been waiting for them for two hours.
我们等他们两个小时了。
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