Active Grammar 2  - grammar auction 	

narrative tenses     
present perfect tense
ability
offers and invitations
	time linkers
permission
request	

1	She's joined the police force since 1998.	
2	Would you have another piece of cheesecake?	
3	We chatted while Ethel made the tea.	
4	I don't suppose you could possibly change this hundred dollar note.	
5	Unfortunately we haven't been able to find a supplier for the paint you asked for.	
6	He had worked in America before he came here.	
7	She couldn't get out of the crashed car but fortunately she could turn the engine off.	
8	Could you mind putting these glasses in the kitchen?	
9	That's the third time you've asked me that question today.	
10	Since he met Vicky he's been a different person.	
11	Do you mind to come to a party this evening?	
12	I was wondering if you'd like to see around the town.	
13	He could speak three languages by the time he was ten.	
14	You may buy cheap clothes and factory outlets in Tsim Sha Tsui.	

Answers	

1	She joined the police force in 1998. or She's been in the police force since 1998	Wrong	
2	Will / Won't you have another piece of cheesecake?	Wrong	
3	We chatted while Ethel made the tea.	Correct	
4	I don't suppose you could possibly change this hundred dollar note.	Correct	
5	Unfortunately we haven't been able to find a supplier for the paint you asked for.	Correct	
6	He worked in America before he came here.	Wrong	
7	She couldn't get out of the crashed car but fortunately she managed to / was  able to turn the engine off.	Wrong	
8	Would you mind putting these glasses in the kitchen?	Wrong	
9	That's the third time you've asked me that question today.	Correct	
10	Since he met Vicky he's been a different person.	Correct	
11	Would you like to come to a party this evening?	Wrong	
12	I was wondering if you'd like to see around the town.	Correct	
13	He could speak three languages by the time he was ten.	Correct	
14	You can buy cheap clothes and factory outlets in Tsim Sha Tsui.	Wrong