because和because of的区别与用法

because后接一个句子，引导原因状语从句eg：I didn't go to park yesterday because it rained. because 与so只能在句子中出现一个，上述句子可改为It rained so i didn't go to park yesterday.because of接名词或名词短语或动名词短语（of为介词，后加doing）上述句子可改为I didn't go to park yesterday because of the rain.