Foundation
English
Verb
Conjunctions
Tenses
Question

Fill in the blank with the most suitable option:
If you want to do well in life you _________ believe in yourself.

need
must
can
don't have to
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Solution
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Answer : D
Let's take a look at the usage of the verbs in the options:
  • can: It is used to express ability or lack of ability / to give permission or express a prohibition / to make an informal request / to express a general possibility (only with a positive verb) / to make a negative deduction
  • don't have to: It is the negative form of "have to"; & is used  to express that something is not a necessity/obligation; & is used to express the absence of an obligation or necessity
  • need: It is used to express a necessity or obligation / to express a requirement for something that is very essential
  • must: to express a necessity (in the present or future); to make an assumption that something is true; to express an opinion about something that is logically very likely
Here in the question, we see that the speaker is expressing that to succeed in life it is requisite, it is necessary that we believe in our-self. Therefore from among the options, 'must' is the most suitable verb to complete the sentence.
  • "can" is NOT used to express an opinion or necessity or obligation, thus it is NOT suitable here.
  • "don't have to" is NOT used to express an opinion or necessity or obligation, it is rather used to remove a necessity, and if we use it here it would completely change the meaning of the sentence.
  • "need" is used to express a necessity or obligation but not an opinion about something logical, also it is used as "need to" and not only "need".
Thus, the correct complete sentence is:
If you want to do well in life you MUST believe in yourself.