三:替代do
为避免动词的重复,使语言简练,常以do, does, did替代前文所用的行为动词。如:
①Tom runs much faster than you do.
②-Lucy, can you get some more tea, please?
-Sure. I'll do it right away.
②-Who broke the cup?
-Mimi did.
③-I like bananas.
-So does he.
四:语气do
为突出感情色彩,do常用于祈使句、强调句和倒装句中,以加强语气。如:
①Do be careful.
②Don't tell a lie.
③He did come.
④-You often go to the park.
-So we do.
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