What is the first conditional?
The first conditional is a structure used for talking about possibilities in the present or in the future.
Conditional type 1 sentences refer to the future. An action in the future will only happen if a certain condition is fulfilled by that time. We don't know for sure whether the condition actually will be fulfilled or not, but condition seems rather realistic - so we think it is likely to happen.
Type 1 conditional = if + present + future
1. FORM :
In a fir