G4417–πταίω–ptaiō

I say then, Did they stumble that they might fall? God forbid: but by their fall salvation [ergänzt: is come] unto the Gentiles, to provoke them to jealousy.

ἔπταισαν eptaisan “they did stumble”

For whosoever shall keep the whole law, and yet stumble in one [ergänzt: point], he is become guilty of all.

πταίσῃ ptaisē “may stumble”

For in many things we all stumble. If any stumbleth not in word, the same is a perfect man, able to bridle the whole body also.

πταίομεν ptaiomen “we stumble”πταίει, ptaiei “does stumble,”

Wherefore, brethren, give the more diligence to make your calling and election sure: for if ye do these things, ye shall never stumble:

πταίσητέ ptaisēte “shall you stumble”