Read the following sentence:
During the weekend, she is happy to simply spend time at home.
In this sentence, the verb “is” does not express any action on its own. It is used to connect the subject “she” to something she enjoys doing – spending time at home.
Let’s look at another example:
That cake smells delicious.
In this sentence, the verb “smells” does not express an action because the cake cannot perform the action of smelling. Instead, it links the subject “cake” to additional information about it.