Researchers from the University of Missouri in the US found that Spanish-speaking preschoolers experience significant improvements in their English skills when they have a good grasp of Spanish letters and numbers.
In another study, the researcher found that behaviour traits play a role in English learning.
"For most Spanish-speaking children, preschool is the first time that they are exposed to an English-speaking environment," said Francisco Palermo, assistant professor at Missouri's College of Human Environmental Sciences.
"Spanish-speaking children who enter preschool with limited English proficiency rely on the classroom setting to build their English skills.
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Children were assessed on their vocabulary, letter and math abilities in the fall and again in the spring.
Looking at the assessments, Palermo found that preschoolers who had strong letter and math abilities in Spanish experienced gains in those English skills.
Building on Spanish skills appears to improve English proficiency during preschool, thereby maximising their ability to enter school ready to learn.
Palermo also tested how children's ability to control their behaviour, such as knowing how to wait your turn, impact English learning.
In that study, he found that enhanced behaviour regulation abilities, which parents can model and teach children, appeared to increase children's likelihood of exhibiting vocabulary and literacy skills in English and Spanish by the end of preschool versus exhibiting them mostly in Spanish.
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