V原(祈使句)：１Study hard,and you will do well. →and表示連帶關係 →意思：認真得讀書，你將會考的好 ２Study hard,or you will do badly. →or表是否則或不然 →意思：請你認真讀書，否則你將會考不好 Ving(動名詞)：表示一件事 To V(不定詞):To save the earth,we have to reduce the trash.→To V表示目的 By Ving→By reducing the trash,we will save our planet.→By表示『靠…的方法』
