When expressions of uncertainty are used, the second clause (second half) of the statement is always written in: B. subjunctive.
What is a subjunctive?
The subjunctive mood of a verb can be defined as a type of clause which is used by a writer to express a wish, an uncertainty or to make statements that are contrary to fact.
This ultimately implies that, the second clause (second half) of the statement is always written in subjunctive when expressions of uncertainty are used.
Read more on subjunctive here: https://brainly.com/question/765891
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