第一个是错误的句子,正确的应该是when we are talking about或者是when talking about.
第一个是进行时强调正在发生,后面一个是它的省略.
你问的第二个是现在一般时,说的是一个没有感情色彩的经常发生的,习惯的,永恒的动作
when we talking about 和 when we talk about
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