“I Insisted That He at Once” — What Does It Mean?

The phrase “I insisted that he at once” appears incomplete in standard English usage. Typically, the verb “insist” is followed by a clause that includes a verb, such as:

“I insisted that he leave at once.”
“I insisted that he act at once.”

In formal or traditional English grammar, “insist that…” often triggers the subjunctive mood. This means the base form of the verb is used regardless of the subject:

• ✅ Correct (subjunctive): “I insisted that she go.”
• ❌ Informal/colloquial: “I insisted that she goes.”

Therefore, “I insisted that he at once” likely omits the main verb after “he.” A complete and grammatically standard version would be:

“I insisted that he depart at once.”

This construction conveys urgency and authority, commonly found in literature, formal writing, or dramatic dialogue.