There____a table with three legs in Tom's room.
问题描述：
There____a table with three legs in Tom's room.
答
There__is__a table with three legs in Tom's room. 这是There be 句型，be 动词的形式与最靠近它的主语 a table 保持一致，故答案为 is。该句意为“在汤姆的房间有一把三条腿的桌子。”
答
is
答
is
表语为a table with three legs
中心词a table是单数