Friday, March 30, 2018

grammar - what is the difference between " when it rains" and "when it is going to rain"




  1. I will buy an umbrella when it rains.





  2. I will buy an umbrella when it is going to rain.




What is the difference between the first one and the second one?


Besides, can I change it to "when it is raining" in the first sentence?


Thanks a lot!




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