My uncle's ambition was <u>to retire</u> and <u>to live</u> a life of leisure.
Explanation:
In grammar, parallelism (also referred to as <em>parallel structure</em> and <em>parallel construction</em>) is the use of the same or similar grammatical structure within phrases, clauses, or sentences.
Parallelism is present in the underlined part of the given sentence:<em> My uncle's ambition was </em><em><u>to retire</u></em><em> </em><em>and </em><em><u>to live</u></em><em> a life of leisure. </em>The grammatical structure that is repeated twice is the infinitive - the basic form of a verb. The infinitive can be used with or without the infinitive marker <em>to</em>. Here, it's used with<em> to</em> both times, although it could've been omitted before<em> live</em>. This is why this is an example of parallelism.
