[译] 她定要我们在那里吃晚饭。
[误] She insisted on that we should have supper there.

[正] She insisted that we should have supper there.
[注] 当 insist 后跟 that 从句作宾语时，不能再加介词 on，此时，insist 是及物动词，表示“坚决要求，定要”。而且 that 从句中的谓语动词应该用虚拟语气，即“should + 动词原形”。