直陳語氣.
現在時.
單數. 複數.
1. I do, 1. We do,
2. You do, 2. You do,
3. He does. 3. They do.
過去時.
單數. 複數.
1. I did, 1. We did,
2. You did, 2. You did,
3. He did. 3. They did.
虛拟語氣.
現在時.
單數. 複數.
1. (If) I do, 1. (If) we do,
2. (If) you do, 2. (If) you do,
3. (If) he do. 3. (If) they do.
過去時.
單數. 複數.
1. (If) I did, 1. (If) we did,
2. (If) you did, 2. (If) you did,
3. (If) he did. 3. (If) they did.
祈使語氣.
Do (you).
不定式.
(To) do.
Doing.
分詞.
不完全分詞—Doing.
完全分詞—Done.
Do的現在和過去時态與現在不定式用作輔助動詞，（1）來表示強調；如，I do study every evening. （2）來表達否定；如，I did not do it. （3）來提問問題; 如， Did you see him?
當 do 表示“執行”的意思時，它是一個獨立的動詞；如，He did his part.
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