理工類輔導資料：主語 系動詞 表語
It is important to learn English grammar.
It was important to learn Russin grammar.
It will be important to learn Russin grammar.
It is important that we learn English.
It was important that we learnt Russin grammar.
It will be important that we learn Russin grammar[Page] 所謂“體”，是指動作在過去、現在和將來三個不同時間所處的狀態。即：常態、進行或完成。那么就有了過去、現在和將來的常態、過去、現在和將來的進行、過去、現在和將來的完成。注意，“體”所表達的主要是對動作的描述，就“主—系—表”結構而言，因為只用來表達靜態的事物，所以不存在進行和完成的問題。我們通過以上例句做進一步的說明：
1． 主語 系動詞 表語
1）. Tom is a college student.
Tom was a college student.
Tom has a college student.
2 ）It is sunny today.
It was sunny yesterday.
It has sunny .
2. S V O 主語 謂語 賓語
Tom studies English now.
Tom is studying English now.
Tom was studying English at 8：00 yesterday.
Tom has studied English.
3. S V 主語 謂語
Tom studies hard.
Tom is studiying hard.
Tom was studying hard before.
Tom has studied hard
4. S V Oi Od 主語 謂語 間接賓語 直接賓語
Tom gives me a book.
Tom is giving me a book.
Tom was giving me a book at that time.
Tom gave me a book.
Tom has given me a book.