请问i-learner 就是i-learner里面有一个会话练习,下面给出了：When you put stress o

请问i-learner
就是i-learner里面有一个会话练习,下面给出了：
When you put stress on different parts of a sentence,,the sentence takes on different meanings.
I went to the cinema yesterday.
I went to the cinema yesterday.
I went to the cinema yesterday.
I went to the cinema yesterday.
I went to the cinema yesterday.
In the sentence above,the words in bold signal where the stress is laid..The stress is the main focus of the sentence.For instance,"I" in the first sentence stresses that "I went to the cinema but the others did not".
Now,let’s see if you can find the main focus of the following sentences by identifying where the stress is placed
Karen is eating a hamburger.
Q1.Karen is eating a hamburger.——————————————
Q2.Karen is eating a hamburger.——————————————
Q3.Karen is eating a hamburger.——————————————
Q4.Karen is eating a hamburger.——————————————