一遍又一遍地重復句式相同、長度相似的句子會使一段話變得枯燥無味。比如：

    We have received your letter of April 2.We are sorry for the wrong dispatch We will do something about it.

    為了避免以上情況的發生，最好使句子結構變化多端，可通過以下方法使句子發生變化。

(1) 改變句子長度。在一段文字中運用長短句交叉，可使句子變得錯落有致。試比較：

    We have received your letter of 2nd July.We regret that travellers cheques are not acceptable.Please give us instructions to make a transfer.

    Thank you for your letter of July 2.We are afraid that the suppliers may not accept travellers cheques for payment.Please give us instructions to make a transfer.

(2) 改變句子結構，以不同的方式來造句。

    Despite our sales increase,profits fell.

    Consequently,the prices came down.

    To reach overseas markets,we must find better means of distribution.

(3) 改變句子的動勢。不要總按照主語——謂語（動詞）——補語的順序造句。試比較：

    I have received your letter of April 10.I shall be arriving in Brussels on May 2. I must return immediately after the meeting. I cannot therefore accept your invitation to dinner that evening.

    Thank you for your letter of April 10. I shall be arriving in Brussels on May 2. Unfortunately, I must return immediately after the meeting, and therefore cannot accept your invitation to dinner that evening.