问题描述：
用there be或have的适当形式完成句子
_____some trees in the park.
my father and mother____a son.
A frog____four legs.
_____four people in my family.
tom_____a new book,nut i don't____one.
______a cup on the table
_____some trees in the park.
my father and mother____a son.
A frog____four legs.
_____four people in my family.
tom_____a new book,nut i don't____one.
______a cup on the table
问题解答：
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