Instead of a simple "I'm sorry," make it more of a complete sentence.

来代替简单的“对不起”，这样会使句子更完整。

youdao

A purpose or reason clause needs a main clause to make a complete sentence.

目的状语从句和原因状语从句与主句一起构成完整的句子。

youdao

Attributes and adverbs, though they are not essential elements of a sentence, help to make the meaning clear or complete.

定语和副词，尽管它们不是一个句子的基本要素，有助于使句子含义清楚完整。

youdao

One of Harbaugh's most used tactics is the vague answer a string of "possibilities" and "maybes" that sometimes make a complete, grammatically correct sentence.

WSJ: Coach Jim Harbaugh Presents: How to