the children have fun,parents can take dance lessons on the beach

不可以，这里用while表示对比，而不是时间状语从句，要是表示“当……时候”要用进行时态的
正确的句子是While
the
children
have
fun,
parents
can
take
dance
lessons
on
the
beach
再如
My
mother
was
cooking
while
father
was
reading
in
the
room

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