Question

I finished all the chotes.The baby was sleeping.( Combine without using and but or so)​

Answer 1

while

The changed sentence becomes 'I finished all the chores while the baby was sleeping' and the suitable word to use is 'while'.

It is simultaneously considered a conjunction and a preposition.

This is because it is a word that joins two separate sentences (conjunction) and is also a word that defines the relationship of one word or part of a sentence to another (preposition).

'while' joins the two sentences, 'I finished all the chores.' and 'The baby was sleeping' and also defines the relationship such that the action (finishing the chores) was completed when another action was taking place (The baby sleeping).