Here are some online resources for singular and plural nouns printable worksheets suitable for Grade 1 students:
1. PBS Kids: This website offers a printable worksheet on Singular and Plural Nouns for Grade 1 students. The worksheet includes exercises such as identifying singular nouns, converting singular nouns to plural nouns, and more. [Download](https://www.pbskids.org/itsmylife/learning-library/reading-and-language/ singular-and-plural-nouns-printable-worksheet.html)
2. K5 Learning: K5 Learning provides a free printable worksheet on Singular and Plural Nouns for Grade 1 students. The worksheet includes exercises such as identifying plural nouns, converting singular nouns to plural nouns, and recognizing plural nouns in sentences. [Download](https://www.k5learning.com/language-arts/singular-and-plural-nouns-worksheets/)
3. ABCya: ABCya offers a free online worksheet on Singular and Plural Nouns for Grade 1 students. The worksheet includes interactive exercises such as identifying singular nouns, converting singular nouns to plural nouns, and more. [Play Online](https://www.abcya.com/singular-and-plural-nouns)
4. Education.com: Education.com provides a printable worksheet on Singular and Plural Nouns for Grade 1 students. The worksheet includes exercises such as identifying plural nouns, converting singular nouns to plural nouns, and recognizing plural nouns in sentences. [Download](https://www.education.com/worksheet/singular-and-plural-nouns-grade-1/)
5. Scholastic: Scholastic offers a printable worksheet on Singular and Plural Nouns for Grade 1 students. The worksheet includes exercises such as identifying plural nouns, converting singular nouns to plural nouns, and recognizing plural nouns in sentences. [Download](https://www.scholastic.com/teachers/library/nonfiction/singular-plural-nouns-grade-1-worksheet.html)
Additionally, you can also try searching for "singular and plural nouns worksheets for Grade 1" or "singular and plural nouns printable worksheets for kids" to find more online resources.
Remember to always check the compatibility of the printable worksheet with your computer or printer before downloading and printing.
