When my brother was told he couldn't join the Swim-Team,he was upset and therefore, I took him to swimming lessons every week until he got into the team!
Vacant means Empty, therefore, a sentence you could use is: "The parking-lot is completely vacant."
Iggle Piggle wandered around therefore he could see Upsy Daisy
The sentence "As I was sick, therefore I could not go there" is grammatically correct, but the use of both "as" and "therefore" is redundant. You could say, "I was sick, so I could not go there" or "Because I was sick, I could not go there."
Whales are sentient beings and therefore shouldn't be hunted.
He didn't go to class; therefore, he failed.The water main broke and therefore, no one could take a shower.I lost my job, so therefore, I could not pay my bills.
The data points were inconsistent and therefore no specific trend could be noted.
The man was incapacitated by his weak heart, and therefore could not join the race.
she had diabetes, therefore, she could not eat sugar
You should use 'therefore' when you are writing a conclusion to something you are describing. So.. you may state one or more facts about a subject and then start a sentence after the facts with: 'Therefore, this means...' or 'Therefore, the conclusion to this debate is...' When you use 'in addition' you are basically saying 'as well as this...' So you could put... 'In addition to these facts...' Sorry if you don't understand this! Hopefully someone will improve the answer. (:
this is my home work, therefore I need to do it at home
He was injured and therefore unable to play in the final round.
Therefore, instead of turning at Faber Street, she crossed it.