When was Sam and Penny at the stationer's ?

They were at the stationer's on Monday.

 

When were you and Susan at the office?

We were at the office on March 23rd.

 

When was I in India?

You were in India in 1985.

 

When were you and Penny in Australia?

We were in Australia in July.

 

When was I at the dairy?

You were at the dairy on Saturday.

 

When were George and I in Austria?

You were in Austria in August.

 

When were they all at home?

They were at home on May 25th.

 

When was I at the hair dresser’s?

You were at the hair dresser’s on Wednesday.

 

When were you and Davie in Finland?

We were in Finland in December.

 

stationer n. 文具店

 

AT （点钟；某一点，小地方）

IN （国家；季节，年，月）

ON（具体某一天）