Agreement
1. Introduction 2. Grammatical agreement verbs: directional 3. Locative agreement verbs: spatial 4. Auxiliary agreement sign 5. Pronominal subjects and objects 6. Use of grammatical space in comparison
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Other directional verbs can be used in a reciprocal manner when the subject is plural. These are known as reciprocal directional verbs. "We've been writing to each other for many years."