An infinitive verb in English is one that is preceded by the preposition TO <em>(and in some situations ended by ING)</em>
The statements that apply to the sentence <em>"To try to write certain sentences is difficult." </em>are:
A.<em> The sentence is correctly written: </em>The statement is grammatically accurate.
B. <em>The sentence contains more than one infinitive: </em>As said before an infinitive verb in English is preceded by the preposition TO, therefore there are two infinitive verbs within it.
C. <em>One infinitive is inside another infinitive phrase: </em>The verb <em>"to try" </em> modifies the meaning of the following infinitive phrase <em>"to write certain sentences is difficult." </em>
Try not to put explanation points.. and always try to seem in the middle. never lean to strong or soft on the subject if you catch my drift