Conditions without If, and If in Unusual Forms

Reference

	Rule	Example
if not	otherwise / or else	otherwise you'll miss it
if not for	without / but for	But for the rain, …
phrase	given the chance / assuming	Given the chance, I'd …
insistence	if + will	If you will keep shouting, …
politeness	if + would	If you would follow me
short forms	if so · if not · if anything · if ever	rarely, if ever

~~Hurry up, otherwise you miss the bus.~~ → Hurry up, otherwise you'll miss the bus.
otherwise + result clause
~~But for your help, I would fail yesterday.~~ → But for your help, I would have failed yesterday.
past → would have + PP
~~If you will come tomorrow, I'll be happy.~~ → If you come tomorrow, I'll be happy.
plain future condition → present
~~If you happen see her, tell her.~~ → If you happen to see her, tell her.
happen to + infinitive

Circle the correct answer.

Save your work regularly; _____ you might lose it. (otherwise / unless / provided)
_____ her quick thinking, there would have been an accident. (But for / Unless / Given)
_____ the chance, I'd study medicine. (Given / Giving / If given to)
If you _____ leave your bike unlocked, it'll get stolen. (will / would / should)
If you _____ take a seat, the doctor will see you shortly. (would / will / did)
If you _____ to be in Rome, visit the Forum. (happen / happened to be / chance)
Do you need a lift? If _____ , I can drive you. (so / yes so / it)
She rarely, if _____ , takes a day off. (ever / never / anything)

Complete the second sentence so it means the same.

If it hadn't been for his help, I'd have quit. (BUT) → his help, I'd have quit.
If you don't book now, you won't get a seat. (OTHERWISE) → Book now; you won't get a seat.
If I were given the opportunity, I'd travel. (GIVEN) → the opportunity, I'd travel.
If you see Tom by chance, tell him. (HAPPEN) → If you see Tom, tell him.
Without your support, I would have failed. → If it for your support, I would have failed.
It's not worse; it's actually a bit better. → It's not worse — if , it's better.