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picture
dictionary
teacher student
girl boy
furniture
television=TV
thirty
ninety
sixty
seventy
eighty
forty
fifty
tree
cat
There is a cat under
the tree.
There are three birds
in the tree.
bird
There is a cat under the tree.
What’s under the tree?
There are two dogs
under the tree.
What’s under the tree?
There is a cat and two dogs under the tree.
There are two dogs and a cat under the tree.
就近原则
be动词单复数形式要跟there be之后的主语保持一致，如果主语是单数或不可数名词用is，如果主语是复数用are。
a desk