Grammar Scan - Michael Swan David Baker 2008

5 modal verbs (1): can, could, may, might
Upper Intermediate

1 В is more polite. See 124.1.

2 А. Сап B. Both.

See 124.5 and 125.6.

3 Both are possible. See 122.6.

4 В and C. See 339.4.

5 It's wrong. Should be: could have borrowed, not could borrow. See 124.4.

6 A and С. (C is more common in British English.) See 125.1.

7 A. See 339.2.

8 A. See 345.2.

9 could. See 345.2.