Scarcely have enough to live on is the present tense of scarcely have enough to live oned.
The third-person singular simple present indicative form of scarcely have enough to live on is scarcely have enough to live ons.
The present participle of scarcely have enough to live on is scarcely have enough to live oning.
The past participle of scarcely have enough to live on is scarcely have enough to live oned.
