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I knew that in the future I have to play in a tough and different condition. I haven't played in that condition yet. Now if I say to someone today that -

1. I knew I have to play in a different condition. That's why I practiced harder.

or

2. I thought I will play in a tough condition. That's why I practiced in mud.

then are my sentences grammatically correct???

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Answered in UsingEnglish.com.

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AyonkhanI knewpast that in the futureof the past I [would have]future of the past to play ...

'would' is the sign of the future of the past.

I knew I would have to play ...
I thought I would play ...

CJ