Choose the correct verb form to complete each sentence.

Choose the correct option.

If the train is late, we['ll be|'d|be] late to the airport.

I'll send you a message later if I [didn't forget|don't forget|won't forget].

If Colin had enough time, he [would come|will come|came] to visit us.

If you heat the water, it [will boil|boiled|boils].

If there is any tea, I [will have|have had|had] a cup.