Washington State K–12 Learning Standards and Guidelines
WA.L.3. Language Standards
Conventions of Standard English
L.3.1. Demonstrate command of the conventions of standard English grammar and usage when writing or speaking.
L.3.1(b) Form and use regular and irregular plural nouns.
L.3.1(e) Form and use the simple (e.g., I walked; I walk; I will walk) verb tenses.