Alternative to IF

The research will continue if there is enough funding.(as long as)

(a)  

You can only do the quiz if you have access to the Internet. (otherwise)

(a)  

This experiment is likely to succeed if we follow all the steps correctly.(provided that)

(a)  

If you are interested in language you could study linguistics. (supposing)

(a)  

The students have an excellent attitude to their studies, but they will drop the subject next year if it is not interesting.(unless)

(a)  

People can participate in the study if they are not enrolled in this course.(whether or not)

(a)  

You can borrow my car if

you promise not to drive too fast.(as long as)

(a)  

If you hadn't helped me, I would have been in big trouble.(but for)

(a)