"Is" is a present tense. "Was" is past tense. As in: Carra is watching TV in the living room right now. Two hours ago she was sleeping in her room.
A bit more:The word 'is' should be used when referring to a present tense, such as "He is a good student". The word 'was' should be used when referring to past tense, such as "He was a very good student."
Other examples: She is a very pretty girl. (present tense) She was a very pretty girl. (past tense).
He is employed by ABC Bank as a loan officer. (present tense)
He was employed by ABC Bank as a loan officer. (past tense)
He was a loan officer, but was later promoted and is now Vice President of the bank. (using present and past tense)
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