you should b-- a present for Allen on his birthday.填bought还是buy?句中能看出是过去时态吗?如果是将来时态就应该是you should buy a present for Allen for his birthday.风唱梵音

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you should b-- a present for Allen on his birthday.填bought还是buy?句中能看出是过去时态吗?如果是将来时态就应该是you should buy a present for Allen for his birthday.风唱梵音

you should b-- a present for Allen on his birthday.填bought还是buy?句中能看出是过去时态吗?如果是将来时态就应该是you should buy a present for Allen for his birthday.风唱梵音
you should b-- a present for Allen on his birthday.
填bought还是buy?句中能看出是过去时态吗?
如果是将来时态就应该是you should buy a present for Allen for his birthday.
风唱梵音

you should b-- a present for Allen on his birthday.填bought还是buy?句中能看出是过去时态吗?如果是将来时态就应该是you should buy a present for Allen for his birthday.风唱梵音
buy也可以,have bought 也可以.
buy 的话意为 你应该为Allen买个生日礼物.(将来时)
have bought 的话意为 你本应该为Allen买个生日礼物的.(实际上没买)(过去虚拟时)

答案是you should buy a present for Allen for his birthday
因为句中有(should 应该)就是还没过去的意思

可用should have bought,表示你本应该.....是过去,若是将来用buy 可以