Use infinitives as substitutes for the overly long phrases in these sentences:

a. For living, I require money.

b. They did not find sufficient evidence for believing in the future.

c. Bringing about the destruction of a dream is tragic.

a. I require money to live.

b. They did not find sufficient evidence to believe in the future.

c. It is tragic to bring about the destruction of a dream.

Explanation:

The infinitive is constructed with the base form of the verb without any inflection connected to tense or subject. Thus, the sentences are rewritten with full infinitives, in which the base form is followed by to, in contrast with the gerund form of the original sentences. In that respect, one of the uses of the infinitive includes to indicate purpose, as in sentence A, while sentences B and C must be rewritten, since the gerund is originally used after prepositions and as the subject of a sentence.