The word "substitute" can be used in various contexts, so I'll provide a few meanings and examples of its usage:
1. As a noun:
A person or thing that takes the place of another.
"She was the substitute teacher for the day."
A replacement for something.
"Can you find a substitute for the sugar in this recipe?"
2. As a verb:
To replace someone or something with another.
"They substituted the regular player with a reserve."
To put something in the place of another.
"The company substituted the old model with a new one."
3. In a sentence:
"Can you substitute milk for water in this recipe?"
"The substitute teacher was very helpful with the students."
"The team substituted their best player for the injured one."
The context in which "substitute" is used will determine its meaning and how it should be incorporated into a sentence.
