skin-diving not only can see many fish and something beabtif

skin-diving not only can see many fish and something beabtiful but also make you
skin-diving not only can see many fish and something beabtiful but also make you have a good health 这句话是对的吗我写作文要用上看下有没有语法错误

你的句子有点文法错误,用了中式英语.
微调版:
Skin-diving not only lets you see many fish and something beautiful but also brings you good health
not only can see是不只能看见直译成英文,但在英语是不通顺的句子.
超级美化版:
Skin-diving not only makes it possible to see many fish,you could also see underwater beauty and reward yourself with a healthy body.
再问： 哪里的语法错误
再答： 因为句子的主语是一样的, 所以but以后的动词还是要加s (Skin-diving是第三身). 还有, 健康是无数的, 所以在good health之前不能用a. 你可以说a apple, 因为苹果是能数的, 但你不能说a dust, 因为你不能以肉眼可见的单位量度尘埃的数量.