在充當成分上沒有什麼區別，都是做謂語，但是助動詞，比如be will can是可以左邊移的，用來直接引導疑問句和否定句，而一般的動詞是不能移動的。
一般動詞可以在句子中擔任謂語，而助動詞不行。助動詞，顧名思義，是幫助實意動詞的，它的作用是幫助動詞構成疑問句，否定句或時態，語態。
常用的助動詞有 do,be, have, 和will, shall等，在使用時，要根據情況作人稱和時態的變化。如：
1. Do you like sports and does your brother like sports?
I didn"t go to the meeting last week.
注：助動詞do/does/ did 幫助動詞構成疑問句，否定句。
2. Li Ming has finished his homework and is playing computer games.
注：助動詞has 和is 分別幫助動詞構成時態（完成時和進行時）
The kids will have a spring outing tomorrow.
注：助動詞will 幫助動詞構成時態（一般將來時）
3. He was very happy as he was praised by his teacher for his progress.
在充當成分上沒有什麼區別，都是做謂語，但是助動詞，比如be will can是可以左邊移的，用來直接引導疑問句和否定句，而一般的動詞是不能移動的。
一般動詞可以在句子中擔任謂語，而助動詞不行。助動詞，顧名思義，是幫助實意動詞的，它的作用是幫助動詞構成疑問句，否定句或時態，語態。
常用的助動詞有 do,be, have, 和will, shall等，在使用時，要根據情況作人稱和時態的變化。如：
1. Do you like sports and does your brother like sports?
I didn"t go to the meeting last week.
注：助動詞do/does/ did 幫助動詞構成疑問句，否定句。
2. Li Ming has finished his homework and is playing computer games.
注：助動詞has 和is 分別幫助動詞構成時態（完成時和進行時）
The kids will have a spring outing tomorrow.
注：助動詞will 幫助動詞構成時態（一般將來時）
3. He was very happy as he was praised by his teacher for his progress.