In the sentence 'They often go to Italy because they love the food', 'They often go to Italy' is the mainclause and 'because they love the food' is a subordinate clause.
在They often go to Italy because they love the food这个句子里,They often go to Italy是主句,because they love the food是从句。
《牛津词典》
2
The mainclause talks about the likely result.
主句谈论可能的结果。
3
A purpose or reason clause needs a mainclause to make a complete sentence.