1.   An ambulance had already arrived, however, and there was nothing they could do.

2.   By the time the ambulance arrived, Douglas had lost consciousness.

3.   I waited for the ambulance to arrive.

4.   Realizing the man had a back injury, we laid him flat on the ground and waited for the ambulance to arrive.

5.   The ambulance arrived in a matter of minutes.

6.   The apparently aggressive Musa, tenderly tries to keep him conscious until the ambulance arrives.

7.   The driver was still conscious when the ambulance arrived.

8.   He was crying out in pain on the ground when the ambulance arrived.