Question

.........i was about to board ,the bus started moving.​

Answer 1

Answer:

When i was about to board, the bus started moving.

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Answer 2

As I was about to board, the bus started moving.

EXPLANATION:  

• The word ‘As’ can be used as Preposition and as a conjunction. ‘As’ is used as ‘an preposition’ with ‘nouns’, for example, As a nurse or as a waiter. Here nurse and waiter is a noun and ‘As’ is used as ‘preposition’ to refer to them.
• But in this question we would be using ‘As’ like a ‘conjunction’ to mean the event or any incident that is taking place. So, here As shows the condition or the situation when such an event occurred..

To know more about Prepositions

Fill in appropriate preposition. The race was ---------------- to begin ​

brainly.in/question/12387136

Write---------me soon(preposition)

brainly.in/question/1184977