Grammar : Because and Because of

• Because
  

S + V + O                               Because                     S + Verb + O
I am wearing a raincoat         because                     it is raining
He didn't pass the exam         because                     he was lazy

• Because Of

S + Verb + O                          Because of                  (noun)
I like Schumacher                because of                   his talent
He did not pass the exam     because of                   his laziness