0 short form of that is or that has: --
That's (= that is) just my opinion.
That's (= that has) got to be the most ridiculous thing I've ever seen.
1 contraction of that is or that has: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.