Exercise state the grammatical name and function the following underling group of words.
(1) what to do is the problem
Grammatical names
Grammatical fundion

Hello. You didn't show which words are underlined, so I'll give you the grammatical name and function of all of them.

What: Pronoun. It has the function of referring to or replacing a noun, representing something, which does not have a specific name, but which needs to be represented in the sentence. The pronoun is a variable word.

To do: Verb. It has the function of representing an action, an activity that will be performed by something or someone.

Is: Verb. It has the ability to represent a state or occurrence.

Problem: Noun. It has the function of naming something or someone.

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

the group received an extra pound of butter for christmas.

the annex was delighted to hear that we'll all be receiving an extra quarter pound of butter for christmas.