If-clauses

[Unregistered]

when explaining the conditional Type 1 (If + simple present, main clause: will-future, simple present or modal + base form) the following question arose:

Which time will be needed in the main clause in the following sentence:

If the online button is illuminated, you ??????? (to make) a mistake.

Do you just need present perfect (have made) or future 2 (you will have made) or what else do you need here?

I´d be very happy to receive an explanation.

Thanks in advance.

 

[cclaff]

when explaining the conditional Type 1 (If + simple present, main clause: will-future, simple present or modal + base form) the following question arose:

Which time will be needed in the main clause in the following sentence:

If the online button is illuminated, you ??????? (to make) a mistake.

Do you just need present perfect (have made) or future 2 (you will have made) or what else do you need here?

I´d be very happy to receive an explanation.

Thanks in advance.

"you have made a mistake" would be the usual way to express this.
But - "if you then decide to proceed anyhow, even though the online button is illuminated, you will have made a mistake."

 

[riverkid]

"you have made a mistake" would be the usual way to express this.

This is a good example of the present perfect of current relevance. Note that CClaff said 'usual'. Certainly, the present simple could be used. It would be interesting to see what percent of AmE speakers chose one over the other in varying circumstances.