If the last sound of a noun or verb is / S /, how do you read the plural or the third person singular plus s? For example, the last sound of sacrifice is / S /, so how should I read this word after adding s? Thank you

If the last sound of a noun or verb is / S /, how do you read the plural or the third person singular plus s? For example, the last sound of sacrifice is / S /, so how should I read this word after adding s? Thank you

sacrifice:sacrifices
For example, face, phase, justice and so on