The students are talking about their hobbies.（ 对talking about their hobbies提问）__are the students__?后面一格到底应该填什么 为什么我看了我的两个同学的答案都写do?

The students are talking about their hobbies.（ 对talking about their hobbies提问）__are the students__?后面一格到底应该填什么 为什么我看了我的两个同学的答案都写do?
The students are talking about their hobbies.（ 对talking about their hobbies提问）
__are the students__?后面一格到底应该填什么 为什么我看了我的两个同学的答案都写do?

The students are talking about their hobbies.（ 对talking about their hobbies提问）__are the students__?后面一格到底应该填什么 为什么我看了我的两个同学的答案都写do?
what are the students doing?

对句子中的动宾结构提问都用waht... do? 当然有各种时态的变化.
这里是进行时态,所以是what are...doing?
they talked about their hobbies. 对这里的talked about their hobbies提问就是
what did they do?

明白了吗?

What are the students doing?

必须是doing，进行时态嘛~~

what are the students doing?

填talking about