Present Perfect - for or since

..... two hours

• for

• since

..... a long time

• for

• since

..... this morning

• for

• since

..... nine o'clock

• for

• since

..... one month

• for

• since

..... last night

• for

• since

..... 2001

• for

• since

..... half an hour

• for

• since

..... I was a child

• for

• since

..... 20 minutes

• for

• since