1 现在进行时.通常用"now".
形式： be + verb +ing
eg: I am(not) doing my homework.
You/We/They are(not) reading.
He/She/It is(not) eating.
动词 -ing 的形式
Most verbs +ing walk-walking
Verbs ending in e -e + ing come-coming
Short verbs ending in a vowel + a consonant run -running swim-swimming
