助动词和be动词怎么使用助动词和be动词在英语语法中有着重要的作用。它们可以用来构成各种时态、语态和情态以及表示否定、疑问等。1 助动词的使用助动词可以用来构成各种时态、语态和情态常见的助动词包括do、does、did、have、has、had、will、would、shall、should、can、could、may、might等。例如：- She does her homework every

"What are you doing?" is asking about a specific action or activity that someone is currently engaged in. It is used in the present continuous tense and is often used in casual conversation.

"What do you do?" is asking about someone's profession or job. It is used in the simple present tense and is often used when meeting someone new or in a more formal setting.