How to Use "Therefore" with Example Sentences

therefore (adv): because of that

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Example sentences:

"He is crying; therefore he must be hurting."

"I think I've stayed too long; therefore I'm leaving in the morning."

"He worked the hardest; therefore he got the promotion."

"I got there really early; therefore I was first in line."

"All of the band members are sick; therefore we must reschedule the concert."