Question

the boy fell into the river but fortunately we -----rescue him. (were able to /could) which is correct answer.​

Answer 1

Answer:

were able to is the answer

Answer 2

Answer:

The boy fell into the river but fortunately, we were able to rescue him.

Explanation:

Tense is an eminent part of grammar. With the proper use of tense, we can determine the time of an event. Tense is of three types, they are as follows:

1. Past tense,
2. Present tense and
3. Future tense.

These are further divided into sub-parts. The above-mentioned sentence is an event that had already happened in past. On top of that, the sentence talks about a specific event, hence we used "were able to" instead of could.