G4417–πταίω–ptaiō

I ask then, did they stumble that they might fall? May it never be! But by their fall salvation has come to the Gentiles, to provoke them to jealousy.

ἔπταισαν eptaisan “they did stumble”

For whoever shall keep the whole law, and yet stumble in one point, he has become guilty of all.

πταίσῃ ptaisē “may stumble”

For in many things we all stumble. If anyone doesn't stumble in word, the same is a perfect man, able to bridle the whole body also.

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

Therefore, brothers, be more diligent to make your calling and election sure. For if you do these things, you will never stumble.

πταίσητέ ptaisēte “shall you stumble”