ing 动名词？
动词ing有以下几种情况：1.动词加ing做谓语；2.动词作介词的宾语要加ing；3.部分动词用动词做宾语；4.一些固定句式后面要加动词ing等。
一、动词加ing做谓语情况
做谓语时动词加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。
例如:
He is reading a book now.
他正在看书.
He was watching TV when his mother came in.
他妈妈进来时，他正在看电视。
They've been waiting for you for three hours.
他们等你三个小时了。
二、动词加ing做非谓语情况
1、动词作介词的宾语要加ing(动名词)
I'm looking forward to seeing you again.
我期盼着再次见到你。
The boy is so excited about hearing from his mother.
男孩收到妈妈的来信，很兴奋。
2、部分动词用动词做宾语。做宾语的动词要加ing(动名词)
I practising speaking English every day.
我每天练习说英语。
Would you mind opening the door?
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