在小学阶段，"do"可以作为实义动词或助动词使用，具体用法如下：
作为实义动词
直接跟宾语：do后面需要跟动词的ing形式，即动名词形式。例如：
Do some shopping.
Do some washing.
Do some cleaning.
作为助动词
构成一般疑问句：在句子开头加"Do"或"Does"。例如：
Do you like playing chess？
Does she like reading？
Do you have any homework to do today？
强调用法
有时态变化：do可以用于强调句，后面接动词原形。例如：
I did my homework yesterday.
They did a lot of good deeds for the community.
固定短语
do away with：废除、摆脱、消灭。例如：
We should do away with plastic bags to protect the environment.
They decided to do away with the old rules.
其他用法
do one's best：尽力。例如：
Everyone should do their best in their studies.
She did her best to help her friend.
建议
根据句子结构选择：首先要判断"do"在句子中是作为实义动词还是助动词使用，然后选择合适的形态。
注意时态和语态：在使用"do"时，要注意句子的时态和语态，以确保语法正确。
积累固定短语：多积累一些常用的固定短语，可以提高语言表达的准确性和流畅性。