There are also fillers, meaningless words that give the speaker thinking time. Examples of fillers are um, well now, uh, let me see. Written language has none of those. Written language tends to be more conservative and old-fashioned. In speech a lot of things are not actually stated.
Speakers often use their tone of voice, or stress and intonation to express important information.
For example, emotions such as pleasure and anger, attitudes such as disbelief or sarcasm, and so on, are often not clearly stated in words. Contents Speech is Fast Speakers decide how fast they will speak, and most speakers speak very fast. So listeners have to listen fast. When reading, the reader can choose a comfortable reading speed, but the listener cannot choose the listening speed. Listeners must listen at the speaker's speed.