对。举例：
While he was tired, he would have a rest.
主将从现的意思是，如果主句是将来时，从句就用现在时代替将来时。
而楼上说的不对，首先句子应该是这样：
While I was a child, I often went to the park.
其次，由于主句不是将来时，所以与主将从现无关。
while I was a child , I often go to the park.
不一定是你说的那样，只可以说两者差一个时态
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