作业帮I have been trying to solve the problem try为什么用ing形式呢
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I have been trying to solve the problem try为什么用ing形式呢
I have been trying to solve the problem try为什么用ing形式呢
I have been trying to solve the problem try为什么用ing形式呢
have been doing是现在完成进行时结构.
表示过去的动作一直进行到现在.
我一直在尝试着解决这个问题.
have been doing是表示现在完成进行时。如果你从过去将一个动作持续到现在，并要强调现在也在做的话，就用这个.这句话就是说我一直在试着去解决问题