Complete
Can I have your . . .? -- Yes, . . .
May I . . . ? -- No, . . .
Could you . . .? -- Sorry, I . . .
1) umbrella please
2) help you I'll do it myself
3) help me I'm buisy
Can I have your sandwich? Yes, certaintly you can
May I take your book? No,you may not
Could you pass me the butter, please? Sorry I cannot