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在對付難文的閱讀時，一定要善于在理解已知信息的基礎上對隨之可能出現的信息進行積極預測。預測時，應學會借助主題句、關聯詞語等篇章信息來提高預測的準確性。如，有一篇短文以這樣一句開頭：
Many people believe the glare from snow causes snowblindness. Yet…這里根據表示轉折的關聯詞Yet，預測到下面可能出現的是主題句，又必然要否定本句中許多人的觀點，即snowblindness(雪盲)可能由glare from snow以外的其它原因引起。原文緊接著的是：Yet，dark glasses or not，they find themselves suffering from headaches and watering eyes，and even snowblindness，when exposed to several hours of “snow light”.
據此主題，我們可以比較有把握地預測到下文將著墨于引起“雪盲”的真正原因，原文如下：
The United States Army has now determined that glare from snow does not cause snowblindness in troops in a snow-covered country. Rather，a man's eyes frequently find nothing to focus on in a broad expanse of barren snow-covered terrain. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing hour after hour，the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs，then is obscured，and the result is total，even though temporary，snowblindness.
但預測不一定總是正確，它需要在繼續閱讀中予以肯定、否定或修正。上例中下文的內容與預測相近，表示理解過程正確。如預測與下文不一致，則可能：①對前面內容的理解有偏差；②據以預測的那部分語言信息可能有多種不同理解，因而可據以作出多種不同的預測。
預測有順向預測和逆向預測兩種，上面提到的為順向預測。所謂逆向預測，實為預測的一種特殊形式，應用于已知下文要推知上文的場合。閱讀中積極運用順向和逆向預測，除了上面談到的能提高對文章的理解深度外，還可幫助我們讀懂本來難以讀懂的章節。
