Because it is necessary to learn English in primary schools. Otherwise, why should education start from primary school? In some places, English classes are offered from kindergarten. First of all, primary education is the foundation of the whole nine-year compulsory education. To improve the quality of education as a whole, we must start with primary education. So learning English at this stage is also very beneficial. After all, English is a language learning. The younger a child is exposed to English, the less difficult it is to learn. Otherwise, there would be no mixed-race bilingual baby.