是What should i buy 还是What shall i buy?

是What should i buy 还是What shall i buy? If i want to buy LCD,what should i know? What should I buy for Tom's birthday? How about_______camera What should I (buy) for her tenth birthday What should I _____(buy)_____(give)them what i have to buy? I really don't know______.A.what to buy her B.what should I 英语翻译1.Which ones shall we buy?I like the red ones.2.What abo what should i do for you?i want to buy a pair of shoes 改错 i don't know what books i should buy for my son 的同义句 I don't know what books i should buy for my son .改为同意句 I really don not know what I should buy for my daughter.