Identify the infinitive phrase and the subject of the infinitive in the sentence below.
mr. hutton asked me to erase the boards.

Answer : to erase the boards

In the sentence " Mr. Hutton asked me to erase the boards", the infinitive phrase is "to erase the boards". An infinitive phrase comes in a very simple formula that is (to + the simple form of the verb) including the  objects if there are any. Infinitive phrases are not only phrases but they can also serve as adjectives, adverbs and even nouns. Here are some examples of infinitive phrases.

My mother told to buy lean meat for lunch.
To be physically fit and attractive is my only wish this summer.

As the boys sleep, military airplanes battle fiercely above the island. none of the boys sees the explosions and flashes in the clouds because the twins sam and eric, who were supposed to watch the signal fire, have fallen asleep. during the battle, a parachutist drifts down from the sky onto the island, dead.