(2)基本形式: be + 动词-ingeg: I am(not) doing my homework.You/We/They are(not) reading. He/She/It is(not) eating.What are you doing? Is he reading? (3)动词的现在分词形式(动词+ing)一般情况 +ing walk—walking结尾是不发音的 e -e + ing come—coming 重读闭音节 双写最后一个字母+ing swim-swimming run-running