careful是形容詞，作定語或表語。carefully是副詞，作狀語，修飾動詞或整個句子。
其用法分別如下：
careful
1、[not before noun] ~ (to do sth) | ~ (not to do sth) | ~ (when/what/how, etc.) | ~ (of/about/with sth)
小心；注意；謹慎
giving attention or thought to what you are doing so that you avoid hurting yourself, damaging sth or doing sth wrong
Be careful!
小心！
He was careful to keep out of sight.
他小心翼翼地躲開別人的視線。
Be careful not to wake the baby.
注意別吵醒了寶寶。
You must be careful when handling chemicals.
接觸化學藥品必須小心謹慎。
Be careful of the traffic.
注意交通安全。
Please be careful with my glasses (= Don"t break them) .
請當心別打碎我的眼鏡。
Be careful you don"t bump your head.
留神別撞了頭。
2、細緻的；精心的；慎重的
giving a lot of attention to details
a careful piece of work
精雕細琢的作品
a careful examination of the facts
對事實的仔細調查
After careful consideration we have decided to offer you the job.
經過慎重考慮後，我們決定給你這份工作。
carefully
1、We carefully watched every detail of his action.
我們仔細觀察了他動作的每個細節。
2、I backed up carefully until I felt the wall against my back
我小心翼翼地後退，直到感覺後背碰到了牆壁。
3、He studied the keyboard carefully, one finger poised.
他仔細研究了鍵盤，一個手指隨時準備敲擊。
4、He folded the paper carefully
他把紙小心地折起來。
5、I am carefully selecting the breeding stock
我正在精心挑選種畜。
careful是形容詞，作定語或表語。carefully是副詞，作狀語，修飾動詞或整個句子。
其用法分別如下：
careful
1、[not before noun] ~ (to do sth) | ~ (not to do sth) | ~ (when/what/how, etc.) | ~ (of/about/with sth)
小心；注意；謹慎
giving attention or thought to what you are doing so that you avoid hurting yourself, damaging sth or doing sth wrong
Be careful!
小心！
He was careful to keep out of sight.
他小心翼翼地躲開別人的視線。
Be careful not to wake the baby.
注意別吵醒了寶寶。
You must be careful when handling chemicals.
接觸化學藥品必須小心謹慎。
Be careful of the traffic.
注意交通安全。
Please be careful with my glasses (= Don"t break them) .
請當心別打碎我的眼鏡。
Be careful you don"t bump your head.
留神別撞了頭。
2、細緻的；精心的；慎重的
giving a lot of attention to details
a careful piece of work
精雕細琢的作品
a careful examination of the facts
對事實的仔細調查
After careful consideration we have decided to offer you the job.
經過慎重考慮後，我們決定給你這份工作。
carefully
1、We carefully watched every detail of his action.
我們仔細觀察了他動作的每個細節。
2、I backed up carefully until I felt the wall against my back
我小心翼翼地後退，直到感覺後背碰到了牆壁。
3、He studied the keyboard carefully, one finger poised.
他仔細研究了鍵盤，一個手指隨時準備敲擊。
4、He folded the paper carefully
他把紙小心地折起來。
5、I am carefully selecting the breeding stock
我正在精心挑選種畜。