It depends to what extent the couple would adhere to earlier customs. What I mean to say is that these days it is becoming more and more acceptable. For example, young people feel that they first want to get know each other even better by living together. When they are absolutely sure that they are able to adapt to each other’s lifestyles, they would then most probably decide to get married.
vt. 使适应,改编
vi. 适应,适合