1) I am sure that I will fail my exams
I can"t pass my exams (pass)
2) I like swimming better than playing basketball
I prefer swimming to playing basketball
3) I will go for a walk if it is sunny .
if it doesn't rain,I will go for a walk.
4)it is quite likely that i will get the job
I may(might)probably get the job .
5) Steve doesn't like working hard
Steve isn't keen on working hard.