substituting
v.v. using one thing or person instead of another. You do this when the original choice is not available or when you want a change.
v. the present participle of 'substitute'; refers to the act of replacing one person or thing with another. Often describes a temporary or functional exchange.
I am substituting honey for sugar in this recipe.
The coach is substituting the injured player with a fresh substitute to maintain the team's energy levels.
By substituting traditional fossil fuels with renewable energy sources, the city aims to reduce its carbon footprint significantly over the next decade.
Often used with the prepositions 'for' (to replace the original) or 'with' (to introduce the replacement).
substituting sugar by honeysubstituting sugar with honeyWhile 'by' is sometimes used in passive structures, 'with' or 'for' are the standard prepositions for this verb.