Select the option that will improve the highlighted part of the given sentence. In case no improvement is needed, select ‘No improvement required’. Why the weather improved, we could go for a walk.

Explanation

Use ‘if’ instead of ‘why’ to improve the sentence grammatically. • Why- it is used in an interrogative sentence to ask for reason. • The sentence is an example of first conditional. • The first conditional (if + present simple, will + infinitive) refers to the present or future; what is said in the condition is possible. • The second conditional (if + past simple, would + infinitive) refers to the present; what is said in the condition is unreal or unlikely. • The third conditional (if + past perfect, would have + past participle) refers to the past; what is said in the condition did not happen.