illustrasses

Verb

form-of imperfect second-person singular subjunctive

illustrerの二人称単数の接続法過去

English Meaning

second-person singular imperfect subjunctive of illustrer

Si tu illustrasses la théorie avec un exemple pertinent, tout deviendrait plus clair.

もしあなたがその理論を適切な例で具体化していたならば、すべてがより明快になったでしょう.

If you illustrated the theory with a relevant example, everything would become clearer.