Question

select all instances of parallel structure. choose three correct answers.
there is no longer any room for hope. if we wish to be free—if we mean to preserve inviolate those inestimable privileges for which we have been so long contending—if we mean not basely to abandon the noble struggle in which we have been so long engaged, and which we have pledged ourselves never to abandon until the glorious object of our contest shall be obtained—we must fight!
from speech to the virginia convention
by patrick henry

Explanation:

Parallel structure (also known as parallelism) is the repetition of a chosen grammatical form within a sentence. In this text, the phrases "if we wish to", "if we mean to", and "if we mean not basely to" follow a similar grammatical pattern (conditional clause with a verb phrase structure). The relative clauses "for which we have been so long contending" and "in which we have been so long engaged" also follow a parallel structure (relative pronoun + preposition + subject + verb + adverbial phrase).

Answer:

"if we wish to", "if we mean to", "if we mean not basely to" (or "for which we have been so long contending", "in which we have been so long engaged")