Spanish language Q&A Forum

In the first sample sentence above, what is the function of 'lo'? There are 4 such examples on this page.

Didn't we learn in another lesson that we could substitute "que" for "porque"? Does that mean "debido a que" and "que" are also interchangeable via the transitive property? I feel like either I am misremembering or there are some nuances I'm not picking up on. 

some 

What

 do you mean by vive tu a manera

Am I correct in understanding that the use of Unos/as is for countable nouns (pears, sunglasses, cellphones... etc)? For non countable nouns such as money, salt, or sugar, you would use a different word to say some?

I want you to help me with simple way of understanding Spanish preterite please

Just a suggestion:  I feel that the question set for this lesson could be more challenging.  Could add 4 or 5 questions with more room for error rather than translating from Spanish to English.  Choices in Spanish where we could easily go wrong.

Texto muy bueno y fácil para principiantes. La misma imagen hermosa con los cines de verano existe en mi país, Grecia.

Is there a difference between saying 'Llevamos trabajando en este proyecto durante meses' vs 'Hemos estado trabajando en este proyecto durante meses' or are both structures practically interchangeable?