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and做连词时,前面一定要加逗号吗?

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and做连词时,前面一定要加逗号吗?
比如
I have a book,a pencil,and a bike.这里逗号能省略么?是一定要有,还是可有可无,或压根不该有?
如果and连接分句的话,之前的逗号能省略么?
and做连词时,前面一定要加逗号吗?
例:
I have a book and a pencil.
I have a book,a pensil,an a piece of paper.
She is kind and beautiful.
She is kind,smart,and beautiful.
看出来了吗,前面有逗号,则后面例举的时候,在and前也要.