当动词是第三人称单数时，动词应该像名词的单数变动词那样加s，如下：

一）一般在词后加s。如：comes, spells, waits, talks, sees, dances, trains

二）在x, sh, ch, s, tch后加es。如：watches, washes, wishes, finishes

三）1）以辅音字母加y结尾的变y为i再加es。如：study-studies, hurry-hurries, try-tries

2）以元音字母加y结尾的直接加s。如：plays, says, stays, enjoys, buys

四）以o结尾加es。如：does, goes

五）特殊的有：are-is, have-has

B）现在分词

当我们说某人正在做什么事时，动词要使用分词形式，不能用原形，构成如下：一）一般在后加ing。如：spell-spelling, sing-singing, see-seeing, train-training, play-playing, hurry-hurrying, watch-watching, go-going, do-doing

二）以不发音e的结尾的去掉e再加ing。如：dance-dancing, wake-waking, take-taking, practice-practicing, write-writing, have-having（be，see alee free flee glee ree tee dree 这几个单词尾部的e要发音）