第一,there + 动词 be(be动词的变化就近原则)
There is a dog.
第二,there seem ( appear/happen) to be+名词
(seem/appear/happen意思分别为:好像/似乎/碰巧)
There happened to be no customer in the shop. 店里碰巧没有顾客
第三,be of (no) +名词
These flowers are of different colors. 这些花的颜色都不同。
This medicine is of no use.
这种药无效。
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