Meaning: This sentence describes two friends who are confident that their friendship will last a lifetime.
Choice of Words: "Forever" means for all time, without end.
Alternative Expressions
They were certain their friendship would last a lifetime.
Meaning: This means that the people in the sentence are very sure that their friendship will continue for their entire lives.
Choice of Words:They is a pronoun that refers to a group of people. Were is a verb that indicates a state of being or existence. Certain is an adjective that means having no doubt or uncertainty. Friendship is a noun that refers to a close relationship between people. Would is a modal verb that indicates possibility or intention. Last is a verb that means to continue for a period of time. Lifetime is a noun that refers to the entire period of a person's life.
Their bond was unbreakable, they'd be pals for eternity.
Meaning: This means that the people in the sentence have a very close friendship that they believe will never end.
Choice of Words:Their is a pronoun that refers to a group of people. Bond is a noun that refers to a close connection or relationship. Unbreakable is an adjective that means cannot be broken or destroyed. They'd is a contraction of the words they and would. Pals is a noun that refers to close friends. For is a preposition that indicates a period of time. Eternity is a noun that refers to an infinite or indefinite period of time.