1.Depends on what kind of relationship you have with the recipient
请问一下 这句我可以写成下面这样吗?
depends on the recipient who you have what kind of relationship with
or depends on the recipient whom you have what kind of relationship
2.another technique is through an advert in which popular
celebrity endorses a product
请问一下为何要用in which?我查了一下好像没有endorse in的用法
如果是in which=where 那后面endorse需不需要接in都不用管囉?
感谢大家回答~

2. 会有in是因为advert 名人"在广告里"为产品背书2.b 改成where的话 确实就不用in(我自己是有点顾虑因为广告不是个"地方" 但也许母语人士根本不介意)我说的顾虑是指能不能改成where 不是改成where的话需不需要in1. 不可以 意思就是取决于关系 不是取决于某个人

Celebrity endorses a product in an advert所以那个 in 跟 endorse 一点关系也没有