Helping verb!...

A "helping verb", aslo known as auxiliary verb (助動詞), helps the main verb by extending its meaning.There are 23 helping words:is am are was were be being been;has have had;shall should will would;do does did;can could may might must.For example, for a main verb such as "sing", the helping words can be used to help extend its meaning:Mandy [is] singing.Mandy [has been] singing since this morning.Mandy [can] sing very well.[Did] Mandy sing the new song yesterday ?[Could] Mandy sing opera ?

我推薦您一個非常不錯的英語學習網站，里面有很多非常不錯的學習資源：

http://www.hkenglishstudy.info

希望可以幫到你!