Question

Choose the correct word/phrase to complete the following sentence:
What _______ you do if you lost your mobile phone?

• A. would
• B. shall
• C. do
• D. have

Answer 1

The correct option is A would

Modal verbs are helping verbs that determine the mood of a sentence, for example, an obligation, ability, possibility, condition, etc.
The given sentence expresses a hypothetical situation (also called conditional sentences), as suggested by the if-clause: "if you lost your mobile phone."
Option A: 'Would' is a modal verb that is often used in conditional sentences with 'if'. It also completes the given sentence in meaning. Hence, option A is most suitable.
Option B: 'Shall' is a modal verb that refers to the future actions. It isn't used in conditionals. Hence B is incorrect.
Options C and D: 'Do' and 'have' are auxiliary verbs (helping verbs) that determine the tense of a sentence. They do not refer to the given conditional sentence. Hence C and D are incorrect.