Final answer:
The second clause of a statement expressing uncertainty is always in the subjunctive verb tense.
Step-by-step explanation:
When using expressions of uncertainty, the second clause (second half) of the statement is always in the subjunctive verb tense. The subjunctive verb expresses doubt, hypothetical situations, wishes, or suggestions. For example, in the sentence 'I wish she were here,' the verb 'were' is in the subjunctive form.
Learn more about subjunctive verb tense