Question

the children became happy. they saw a rainbow. (join using an infinitive)​

Answer 1

Answer:

the children became happy to see a rainbow.

Explanation:

the appropriate infinitive to use to join these sentences is "to see" because an infinitive usually starts with a "to" with a base verb "saw" . it acts like a conjunction here and we write the verb in simple present tense "see" which means the answer will be the children became happy to see a rainbow.

Answer 2

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The given sentence is The children became happy. They saw a rainbow.

We have add this both sentences by using an infinitive word

The answer is:

The children became happy to see a rainbow.