A 有些動詞只是及物動詞; 它們不可以單獨用,后面必須跟賓語.
{ False:They always want after lunch.
Right:They always want a cup of tea after lunch.
{ False:He is sending now.
Right:He is sending a letter now.
B 有些動詞只是不及物動詞；它們可以單獨用,如果后面想接賓語,動詞后面必須加上介詞.
{ Right:He is looking around.
False:He is looking me.
Right:He is looking at me.
{ Right:He is listening carefully.
False:He is listening the teacher carefully.
Right:He is listening to the teacher carefully.
C 有些動詞既是及物動詞,又是不及物動詞; 但是有時候詞義會改變.
{ The customer is asking loudly.
The customer is asking for you now.
The customer is asking a question now.
{ If you work hard,you will succeed.
If you work hard,you will succeed in passing the exam (same meaning).
If you work hard,you will succeed John as the manager of this company (different meaning 英語中按動詞后可否直接跟賓語,可把動詞分成及物動詞和·
不及物動詞：字典里詞后標有vi.的就是不及物動詞.不及物動詞后不能直接跟有動作的對象（即賓語）.若要跟賓語,必須先在其后添加上某個介詞,如to,of ,at后方可跟上賓語.具體每個動詞后究竟加什么介詞就得聯(lián)系動詞短語了.