Question

Fill in the blank using the most appropriate option:

If they want to succeed, they _____ have to work very hard.

• A. Ought
• B. Should
• C. Must
• D. Will

Answer 1

The correct option is D Will

Option D: 'Will' is a modal verb that expresses the future tense. It modifies the main verb and states an event that is yet to happen.

The given sentence is a type 1 conditional, i.e., it states a possible condition 'if they want to succeed' and its probable result 'they will have to work very hard'. The latter is in future tense, and 'will' fits in here. Hence option D is correct.

Options A, B and C: Ought, should and must are modal verbs that refer to obligation. They do not express the future tense. Hence these options are wrong.