Join the sentences using since. Do not change the order of the sentences. 1. George loves animals. He is planning to become a vet.?

You use the present perfect tense before "since":-
eg:-George has been planning to become a vet since he loves animals.
If we do not change the order of the sentence:, then since
pronoun is a word that is used instead of a proper noun, such as "he" instead of "George",then
eg:-Since he (George) loves animals, he is planning to become a vet.
vet.=veterinary, relating to the medical care and treatment of sick animals; veterinary medicine; veterinary surgeon

Since George loves animals, he is planning to become a vet.
原因＋結果
副詞子句＋主要子句。