Question

Fill in the blank with the most appropriate word.
A: How is your father’s cold?
B: ______ it gets worse, we will call the doctor.
A) Should
B) Might
C) If
D) Unless

Answer 1

Hint:First we must know the uses of all given words. Choose the option which will be grammatically correct for the given sentence and also we must see that the selected option will make the sentence meaningful.

Complete step-by-step answer:
Here the given sentence is a conditional sentence. You must be thinking, what is a conditional sentence? Now let’s study about the conditional sentence first and its rules.
Conditional sentence: It is a type of sentence which expresses a condition. A condition is something that can only happen if something else occurs. It contains two clauses in the sentence which are called an “independent clause” and a “dependent clause” that almost always begins with “if”. Those sentences which have both of these parts are called conditional sentences.
Example: If she comes, I will go.
So here in the example you can see the 2nd clause totally depends upon the 1st clause. So the result part totally depends upon the conditional part. It is clear here that ‘I will go only if she comes’.
Five conditional sentences are there which we use in conversation.
- Zero conditional
- First conditional
- Second conditional
- Third conditional
- Mixed conditional
The given sentence is the first conditional sentence so let’s discuss how we would identify the sentence structure.
First clause will be in the present simple and the second clause will be in future simple.
Example: If she teaches us, we will study.
Let’s examine and understand the given option above:
Since the given sentence is a first conditional sentence so an appropriate answer will be option [C] if, because the conditional sentence begins with ‘If. As per the rule of the first conditional sentence it is absolutely suitable and a correction option for the given question.

Note:For choosing the correct option you should know the actual and correct meaning of the asked sentence.
Study of all types of conditional sentences are required.