Modal verbs are verbs that indicate likelihood, ability, permission or obligation. Modal verbs change the intention or meaning of the main verb in a sentence by showing whether an action is: Learn ...

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Subject-verb agreement means that your verb must be conjugated, or changed, to fit (or agree) with the subject. Subjects can be singular or plural. Think of singular and plural as mathematical ...

The reason is verbs in the singular third-person subjunctive ignore the subject-verb agreement rule. They drop the "-s" or "-es" at their tail ends and take the base form of the verb (the verb's ...