直陈语气.
现在时.
单数. 复数.
1. I do, 1. We do,
2. You do, 2. You do,
3. He does. 3. They do.
过去时.
单数. 复数.
1. I did, 1. We did,
2. You did, 2. You did,
3. He did. 3. They did.
虚拟语气.
现在时.
单数. 复数.
1. (If) I do, 1. (If) we do,
2. (If) you do, 2. (If) you do,
3. (If) he do. 3. (If) they do.
过去时.
单数. 复数.
1. (If) I did, 1. (If) we did,
2. (If) you did, 2. (If) you did,
3. (If) he did. 3. (If) they did.
祈使语气.
Do (you).
不定式.
(To) do.
Doing.
分词.
不完全分词—Doing.
完全分词—Done.
Do的现在和过去时态与现在不定式用作辅助动词，（1）来表示强调；如，I do study every evening. （2）来表达否定；如，I did not do it. （3）来提问问题; 如， Did you see him?
当 do 表示“执行”的意思时，它是一个独立的动词；如，He did his part.
