Four and five is nine. 四加五等于九。(数词) Walking is good exercise.走路是很好的运动。(动名词) To see is to believe. 眼见为实。(动词不定式) What you need is more practice.你需要的是更多的练习。(从句) (二)谓语(Predicate Verb) 谓语是用来说明主语做什...