An infinitive phrase is a group of words introduced by "an infinitive", This group of words may function as a noun, adjective or adverb. In the following example the infinitive phrase is working as an adjective, since it modifies the noun "topic".
<em>The best </em><u><em>topic</em></u><em> </em><u><em>to write about</em></u><em> </em><em>is one you know well.</em>
<em> noun infinitive phrase</em>
You need to provide the text so we can see what type of document it is
Answer: it was a cold windy day.
Explanation: it was not punctuated at all which it should have been
Genetically modified food can help with diseases by adding proteins to transgenic crop plants.
