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if i want to say that something is going to be worse later if u do that ,can i say
-it's going to be worse next
-it's going to be worse later
-it's going to be worse afterwards

how can i say it?

and another one...if i want to say
-the only problem i have with going are my knees(in case of going to jog,for example)

thanks
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if you use the first one, I'd be looking for another word on the end, like
"next year" or "next week", even "next time" .. I would not just end the phrase with "next"
Comments  
Before you asked, you had already chosen " .... worse later " Emotion: stick out tongue. I think all three are Ok

The only problem I have with ( in ) exercises is my knees.
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 suzi's reply was promoted to an answer.
i think that maybe with "afterwards "it will work,dont u think?and about the knees,i dont know if it is with "are"or is,any advice will be useful
The first attempt is bad enough, it's going to be worse nextEmotion: smile ( next attempt )

To determine is or are has nothing to do with your knee or knees Emotion: stick out tongue. It depends on the singular or plural subject. Since you said ' The only problem ', then ' is ' is usedEmotion: smile
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just like that"it's going to be worse next"i mean after that it's going to be worse,"it's going to be worse afterwards or after"can i say it?i dont know if it's going to be worse next sounds good since i want to say just that sentence"it's going to be worse...."

thanks