1.Were you happy when you were a primary school student?Yes,i was.
你在读小学的时候开心吗?
2.DID you work hard when you were in the primary school?Yes,I did.
你在读小学的时候有努力学习吗?
2.DID you have a good friends when you were in the primary school?Yes,i did.
你在读小学的时候有交到朋友吗?
3.DO you like the primary school life?Yes,I do.
你喜欢小学的生活吗?第一个为什么不填did因为happy是形容词，所以只能前面用be动词。例如， i am happy。