if there had were a heavy snow,i might not have gone skating.

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iftherehadwereaheavysnow,imightnothavegoneskating.iftherehadwereaheavysnow,imightnothavegoneskating.

if there had were a heavy snow,i might not have gone skating.
if there had were a heavy snow,i might not have gone skating.

if there had were a heavy snow,i might not have gone skating.
不对
if there had been a heavy snow,i might not have gone skating