Question

They decided it .They should go.(rewrite using second sentence as an infinitive phrase)
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Answer 1

The given sentence with infinitive phrase can be written as shown below:

They decided to go.

Explanation

Infinitive is to+infinitive structure case. To+infinitive form of verb is belongs to the non-finite verbs family. The characteristic of these verbs is that their forms remain the same (unchanged) in all types of tenses.  

Example: She likes to swim. She liked to swim. She would like to swim.    

Answer 2

Sentence with infinitive phrase:

They decided to go.

Explanation:

• The infinitive phrase contains verbs with to-infinitive which expresses an action in a sentence.
• In the given sentence, "going somewhere" is the action expressed.
• Thus, to-infinitive form of go which is "to go" is included in the sentence.
• It is a part of the sentence which defines the action of the pronoun "they."