Срочноооо. 20б . Образуйте сложноподчиненые предложения, используя слова when, if, as

Срочноооо. 20б . Образуйте сложноподчиненые предложения, используя слова when, if, as или because .
1.I knocked at the door. Susan opened it
2.Mr.Priestly saw me. He came forward to meet me.
3. We sat near the fire. The evening was cold
4. I was rather tired. I went to bed early.
5. You are not warm enough. Put on the eiderdown