they should buy them for you

Ask you parents for the new shirts. They should buy them for you.
Pide a tus padres para las camisas nuevas. Ellos deberían comprártelas.
Submit your request for office supplies to one of the managers. They should buy them for you.
Pídale a uno de los gerentes los materiales de oficina. Ellos deberían comprárselos.
This is a list of school supplies for your parents. They should buy them for you before school starts.
Esta es una lista de materiales escolares para sus padres. Ellos deberían comprárselos antes de que empiecen las clases.
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