Question

He never feels lonely simply because he does not have any siblings. Yufa 261

Accepted Answer

他从来不因为没有兄弟姐妹而觉得寂寞。<cannot be a 所以 instead>('因为。。。就/而 + verb/verbal phrase' where 就 implies the reason is insufficient)Subject MUST appear only once before 因为 with 就/而.

Front	He never feels lonely simply because he does not have any siblings.
Back	他从来不因为没有兄弟姐妹而觉得寂寞。<cannot be a 所以 instead> ('因为。。。就/而 + verb/verbal phrase' where 就 implies the reason is insufficient) Subject MUST appear only once before 因为 with 就/而.
Page	Yufa 261

Feels Lonely Simply Siblings 他从来不因为没有兄弟姐妹而觉得寂寞。<Cannot 所以 Instead> 因为。。。就/而