Past Perfect Continuous: Como utilizar

Olá! Estou tendo dificuldade no seguinte:

Imagine que você trabalhava Como professor por 4 anos mas agora trabalha com outra coisa. Qual seria o certo?

1) I had been worked as a teacher for 4 years but now I am working as a mechanic. It's been 5 months since I started my new job.
2) I was working as a teacher for 4 years but now...(continue)...

Outro exemplo, vamos supor que voce tava pintando a casa a manha toda mas agora ja eh noite e você ta em casa.

1) I had been painting the house all the morning and that's why I am tired.
2) I was painting the house this morning and that's why I am tired.

Obrigado!