How do I write "but if" in Chinese?

Question

How can I express that something happens if another condition is true? (Eng: "Subject ... but if ... subject ...") Example: > I usually get up at six o'clock, **but if** I'm really tired, I sleep until eight. > 我常起來六點，但是很累到八點睡覺。　（Can I write this?)

Answer 1

For your example of ">I usually get up at six o'clock, **but if** I'm really tired, I sleep until eight. ", the translation should be "我通常六点起床， 但如果太累，我会睡到八点才起来 "

Answer 2

but if in Chinese is但是如果 for example. 我平时都是9点起床，但是如果没有课，我会10点起。 I usually get up at 9 am, but if i don't have class that day ,i will get up at 10 am