are these words commonly used？：很好 、极好 、非常好 、相当好 、特别好 、十分好、极其好 I am wondering what the differences are between these and how they could be used (example sentences would be awesome!). Thank you!
Let's forget about '好', you can replace it with any other adjective. Your question is about the difference between superlatives
很 = is; very
极 = very; extremely
非常 = very; extraordinarily
相当 = quite; very
特別 = very; especially
十分 = very (fully)
极其, 极之 (more colloquial) are the same as 極 (more literary)
Examples:
她的成绩很好 = her grade is good/ her grade is very good
她的成绩极好 = her grade is very good/ her grade is extremely good
她的成绩相当好 = her grade is quite good/ her grade is very good
她的成绩特别好 = her grade is very good/ her grade is especially good
她的成绩十分好 = her grade is very good
More examples:
他跑得很快 = he runs fast/ he runs very fast
他跑得极快 = he runs very fast/ he runs extremely fast
他跑得相当快 = he runs quite fast/ he runs very fast
他跑得特别快 = he runs very fast/ he runs especially fast
他跑得十分快 = he runs very fast