First conditional sentences

Certain grammar websites describe type 1 conditional sentences as the ones in which the time is the present or future and the situation is real.

Examples given are:

• If I have time, I'll finish that letter.

• What will you do if you miss the plane?

• Nobody will notice if you make a mistake.

• If you drop that glass, it will break.

• If you don't drop the gun, I'll shoot!

• If you don't leave, I'll call the police.

I wish to ask "In what circumstances the above sentence examples can refer to present time as defined above since they all appear to be referring to the future"?

Solution 1:

In type 1 conditional sentences

1. The tense in 'if' clause is always simple present.
2. The tense in the main clause is simple future.

So all your given examples are correct and according to the definition.