An uncertainty, possibility, condition, doubt etc.
The word 'if' is correct and usable in written English. You can use it to express a condition, to indicate a choice, or to introduce a hypothesis. For example: "If I had known about the meeting, I would have attended."
If only it were true.
I wanted to give society a chance to determine if it should change itself.
We will also ensure that if there are any lessons to be learned, they are shared as soon as possible.
"Although the investigation is in its early stages, we will take action to protect the public if we uncover evidence that could affect the safety of other rides at the park or elsewhere".
If it were done when 'tis done, then 'twere well it were done quickly.
"I think it's for women to make a choice about what clothes they wish to wear, if they wish to wear a veil that is for a woman to make a choice.
David, if you think this election is about leadership, then debate me one on one.
"We do not know if the Chibok girls can be rescued.
If you see what I mean.
"Ask yourself: if I were a Chinese spy, why wouldn't I have flown directly into Beijing?
If I could save the Union without freeing any slave I would do it, and if I could save it by freeing all the slaves I would do it; and if I could save it by freeing some and leaving others alone, I would also do that.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union