It's not that bad.

it's Contraction

— The contraction of "it is". Bring you coat. It's raining. "Where's the book?" "It's on the teacher's desk." "What's that?" "This? It's just a piece of paper." — The contraction of "it has". It's been a long time since I've had cake.

not Adverb

— "Not" makes the verb of a sentence have the opposite meaning. I was not there. I am not fat!

not Conjunction

— The item before "not" is more correct or better than the item after "not". I wanted tea, not coffee! Meaning: I wanted tea. I did not want coffee. It's stupid, not funny. Meaning: It is stupid. It is not funny.

not Interjection

— Used to indicate the sentence before is sarcastic or ironic. This means that the sentence has the opposite meaning. I like doing lots of boring homework. Not! Meaning: I do not like doing lots of boring homework.

that Determiner

— Used to show which thing we are talking about; used with things that are not close to the speaker. Give me that book, not this one. Give me that, not this. That dog is hungry.

that Subordinator

— used to link a subordinate clause to a main one You said that you liked me. Give me the book that I dropped.

bad Adjective

— If something is bad, it is not good. The man who killed his wife was very bad. Skipping school is a bad thing to do. Debts can go bad when a debtor has gone bankrupt. Could things get any worse than this? This is the worst time I've had all year!