would buy,主句谓语是过去时,宾语从句要使用相应的过去时态,would buy为过去将来时。
例句：She said she would buy the book when it comes out in paperback. 她说等那本书出平装本时再买。
扩展资料
例句：
He hinted that he would buy the house.
他透话要买这所房子。
For example, when asked whether they would buy a new smartphone this year, only 48 percent said yes--a six-point drop from 2015.
例如，当问及他们是否今年会买一部新的.智能手机时，只有48%的人回答会，相较于2015年下降了六个百分点。
They would buy toys and candy.
他们会买玩具和糖果。
Would you buy a used car from this man?
你会从这个人手里买一辆旧车吗？
