Question

When I____ (reach) the bus stop, the bus had already left. ( use a suitable tense form)​

Answer 1

When I *reached* the bus stop, the bus had already left.

In this sentence, the past perfect tense "had left" is used to indicate that the action of the bus leaving occurred before the action of reaching the bus stop.

Answer 2

reached

Step-by-step explanation

i used reached because it's a tense form