We have some tennis rackets改否定句

1.We do not have tennis rackets.
2.Does Helen have a baseball bat?
has have
has常用于第三人称单数形式,而have则用于否定句和疑问句,并且还用于不是第三人称单数的主语.
例：She has a baseball
she does not have a baseball
Dose she have a baseball?
I have a baseball
some any
some和any都是一些的意思,但是some用于肯定句,any用于否定句和疑问句
例：I have some baseballs
I do not hve any baseballs
Do you have any baseballs?
do does
do和dose都是助动词,丹does用于第三人称单数形式,而do则用于不是第三人称单数的主语

We don't have any tennis rackets.
Helen doesn't have a baseball bat.
第三人称单数用has 、第一人称和第二人称用have、肯定句用some、否定句和疑问句用any、

We don't have any tennis rackets.(some一般用于肯定句，而any一般用于否定句和一般疑问句）
Does Helen have a baseball bat?(改一般疑问句时，如果原句中有be动词（am is are及其过去式等），就将be动词提前，如果没有，就加助动词（do或does,当主语是一二人称或名词复数，即：I 和you时，用do；主语是三人...