Can I come in?

A request to enter a particular place. A: "Hey, can I come in? I need to talk to you about something." B: "Sure, just close the door to my office."

Could I come in?

Do you mind if I enter? (A polite request. Also used with can or may in place of could.) Tom (standing in the doorway): Hello, I'm with the Internal Revenue Service. Could I come in? Bill: Hi, Tom. What are you doing here? Tom: Could I come in? I have to talk to you. Bill: Sure. Come on in.

词组	Can I come in?
释义	Can I come in? Can I come in? A request to enter a particular place. A: "Hey, can I come in? I need to talk to you about something." B: "Sure, just close the door to my office." See also: can, come Farlex Dictionary of Idioms. Could I come in? Do you mind if I enter? (A polite request. Also used with can or may in place of could.) Tom (standing in the doorway): Hello, I'm with the Internal Revenue Service. Could I come in? Bill: Hi, Tom. What are you doing here? Tom: Could I come in? I have to talk to you. Bill: Sure. Come on in. See also: come, could McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. See also: clearance get (the) clearance to (do something) be up to (something) it is the pace that kills blaze blazes blazing hay is for horses (I) just want(ed) to tell you (something) (first) dibs (on something)
随便看	dogsbody dog's chance dog's life dogs of war dog somebody's footsteps dog('s) soup dog stinkhorn dog style dog-style dog's years dog tired dog-tired dog-ways dog whistle dog’s mother do heart good Do I have to draw a picture? Do I have to draw you a picture? Do I have to draw (you) a picture? Do I have to paint a picture? Do I have to paint (you) a picture? Do I have to paint you a picture? Do I have to spell it out? Do I have to spell it out (for you)? Do I make myself clear?