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